VW TDI forum, Audi, Porsche, and Chevy Cruze Diesel forum banner

1 - 5 of 5 Posts

Super Moderator
23,902 Posts
Discussion Starter #1 (Edited)
continued from http://www.myturbodiesel.com/1000q/a5/VW-jetta-TDI-buying-checklist-2.htm

If you hold the key in the door to unlock or lock, it will open or close all the windows and sunroof. If you enable comfort windows, it will also let you do it with the remote key fob. A demo is below. See 1000q: comfort window remote for details if you have a 2009. They changed the electrics for 2010 so if you have a 2010, see 1000q: 2010 comfort windows.

Never put your keys in the trunk because if you open the trunk, put your keys in with some bags, etc., and then close the trunk, the doors will be locked with the keys in the trunk.

The Jetta sedan and wagon are made in Puebla, Mexico and shipped by cargo ship or train to the US and Canada.

The soundproofing on mk4 cars rubbed and often caused rust at the top of the fenders. Your mk5 VW TDI also has this and it's possible it could also happen on yours. See 1000q: fender rust solution for the repair.

Some have had defective high pressure fuel pumps. This is supposedly linked to a certain production range but VW isn't saying much about it. If you open the fuel filter canister at the 20,000 mile change interval and see tiny metal flakes, your fuel pump is disintegrating. It should immediately be brought to the attention of the dealer while under warranty. After that, keep your fuel receipts in case they accuse you of putting gasoline in the car. Diesel fuel is an oil and lubricates the fuel system. The entire fuel system must be replaced because the flakes have already damaged the injectors and pumps. See 1000q: how to replace the fuel filter for tips on opening the filter canister.

If they replace the fuel tank make sure the install plugs are removed. If they aren't you'll hear sucking when you open the fuel filler cap as in this case: http://www.myturbodiesel.com/forum/f19/fuel-tank-vacuum-tank-collapse-18029/

A few people have had pinhole leaks in the high pressure fuel system which showed up early on. This results in a fuel leak and diesel odor. If this happens to you, report it to the NTSHA since any potential fire hazard should be reported. Here are a few threads which discuss this - it appears to show up on #2 injector line often and it could be a design weak spot. http://www.myturbodiesel.com/forum/f19/fuel-leak-6757/ and http://www.myturbodiesel.com/forum/f19/2011-vw-jetta-fuel-leak-6919/

Any diesel engine having a rare mechanical malfunction called a runaway engine could cause it to self destruct. Since diesels are throttled by fuel and not air, if they eat their own engine oil, it causes a feedback cycle in which the engine races higher and higher. If the car is in gear it will also accelerate. Immediately shut off the ignition as soon as it's safe and practical and take it to a mechanic before starting it again. Read more about a diesel engine runaway and some causes at 1000q: runaway engine FAQ.

When it's colder than 48oF, wait at least 1 second after turning the key to "on" before turning the key to "start" and starting the engine. This lets the glow plugs turn on and warm up. The "wait to start" glow plug indicator light normally goes out in less than 1 second and could be on as long as 4-5 seconds when it's below freezing. For more information on the multifunction display options, see 1000q: MFD menu FAQ. There is also a chime that sounds when the temperature drops below 39oF to warn of possible freezing conditions.

Some TDI have gotten condensation in the intake which settles in the intercooler. In cold weather, this condensation can freeze and cause rough cold running or harder start. The main symptom is that once you start moving, the engine rpm goes up which moves the intake air faster and the engine stumbles. This will not throw a check engine light/malfunction engine light. The danger is that if too much fluid makes it from the intercooler to the engine, once inside the engine cylinder, can hydrolock the engine and bend the engine cylinder rods. This is discussed in this thread: http://www.myturbodiesel.com/forum/f7/cr-cold-weather-inspection-4197/ The milky look is from the oil condensation mixing with water.

When you turn the key on and off you may hear a high pitched electric sounding whine from the front of the engine for a few seconds. This is the EGR valve self calibrating.

The heated side view mirrors only work if the outside air temp is below 68oF. The earlier design side view mirrors were on if the power window switch is set to the middle position and often burned out.

It's normal for the DRL light in the speedometer gauge to be on. It means the DRL are on and normal. If the car senses a burnt out bulb it will display a message in the instrument cluster display.

The sunroof has an open position beyond "full open".

This shows some designers talking about the new Jetta and some features of the car. This is available in 720 HD version at youtube which is why it has the black bars here. The video was made for the 2005.5 models so as mentioned earlier, some of these features were decontented.

This is part 2 of the video. This is available in 720 HD version at youtube which is why it has the black bars here.

The new common rail engine uses a timing belt and will need a deluxe/full timing belt change every 120,000 miles. This includes changing all idler pulleys/rollers, water pump, timing belt tensioner, and timing belt. If you do it yourself, parts should cost about $400. Since many VW dealers are not yet experienced with diesels and the new TDI engine, ask around for a TDI expert before going to the dealer. Dealers not experienced with TDI engines have damaged engines in the past due to lack of experience and bad techs. Expect to pay about $900-1,300 at the dealer for this service.

The 2009 and newer TDI use a 120,000 mile timing belt but it cannot be used on the 2005-2006. The 2009 and newer TDI engines are totally different and the belts are not compatible. A common rail engine has smoother power delivery and isn't driving the fuel injection pump at the timing belt. The rattling sound of diesel combustion on older engines is from jerky combustion. Although the engine flywheel dampens this motion, it does slightly pull on the timing belt. The longer interval may also be from slightly different materials and parts.

Some owners report an engine hiccup when warm or engine shudder when at half application. So far VW has not come out with a fix but it's believed to from the EGR (exhaust gas system) cycling.

If you unlock the car and don't open the driver's side door within 30 seconds, the car will relock. This is to prevent accidental unlocking. If your car has weird door locking problems or doesn't seem to know that the driver's side door was opened, your door handle module is bad.

Some dealerships, even luxury car dealerships, do a bad job detailing new cars due to sloppy and fast work. Bad detailers can even damage your new car's finish. I recently saw a new car at a dealer with a plastic gas tank strapped to the hood to advertise it's fuel economy! This is unacceptable because it put a bunch of fine scratches into the paint. I recommend washing, claybar, and then waxing your new car yourself. This removes the corrosive railroad dust if they came by rail, sal****er spray/sand while sitting at the port, and road detritus during transport. See detailing tips at 1000q: washing and wax your car , 1000q: claybar your car. While you shouldn't apply wax to a freshly painted or repaired panel, the factory paint is cured and baked in an oven and had plenty of time during transport.

Because of the newer technology on the mk5 cars, there are many car settings that must be set up during new delivery. CAN BUS technology cars (mk5 VW) come from the factory in sleep mode to prevent battery drain. Sometimes these settings are never configured (dealer error) or reset later. Some examples are the power seat and the power windows/sunroof remote functions. The window pinch protection can even be turned off. These options can be adjusted with a VCDS diagnostic tool (used to be called vag-com) or the dealer can do it. These also happen when you disconnect the battery. Once clue is that the yellow steering wheel symbol showing steering sensor problems and ESP stability control malfunction lights are on. To reset window pinch protection and reset steering and ESP, see 1000q: reset pinch protection and steering sensors.

The engine coolant is "lifetime" G12. Do not mix it with green Prestone or other non compatible coolants. It's a sealed system so if it's low, figure out where the leak is.

Many German cars have fast speedometers. The speedometer error on some cars was as high as 10%. A few percent is no problem but a very fast speedometer should be corrected by the dealer. See 1000q: high speedometer reading correction for the procedure. The odometer reading should be correct for warranty and maintenance purposes. In addition, most users report that the fuel economy meter is fairly accurate.

The sunvisors swivel at one and and unhook at the other but they also slide out to become "longer" when unhooked. The armrest also slides forward.

If the doors were locked, the front doors will open with the first pull of the interior door handle. The rear interior door handles require 2 pulls - the first unlocks the door. The second pops the door open.

The key uses an anti-theft device called an immobilizer. You can only have new keys programmed at the dealer, the few rare independent locksmiths who have the equipment, or with a few aftermarket solutions. See 1000q: immobilizer FAQ for more details. The issue is that although the key can unlock the door, an unprogrammed key won't let the engine stay running. For this reason, avoid ebay keys until you shop around for the dealer price. Also avoid used keys because the new immobilizer chips can only be programmed once. In other words, you may be able to reuse old parts from a used key but the chip inside the key will only work for 1 specific car. If you want to attempt key programming, see 1000q: a5 Jetta key FAQ.

Apply the parking brake when parking! It's good practice with any car but it is important on VWs because this sets the rear caliper self adjusters. It's best to apply the brake before going into park (auto trans) or first/reverse gear (manual trans) to put stress on the brake instead of the transmission internals.
Safely raise the rear of the car and spin each rear wheel by hand. Stay to the side and don't get under the car or put your hand in a position where it could be crushed if the car falls! Some cars come from the factory with misadjusted parking brakes. Light scraping and touching on the brake rotors is normal, resistance is not normal and should be adjusted by the dealer.

The headrests are fixed forward for excellent anti-whiplash crash safety but it can be uncomfortable for some. The 2005.5-2006 seats use active headrests that moved forward and down but had a slightly lower rating. The 2007-2008 seats had passive headrests that weren't tilted forward but were rated even lower.

It's normal for the windshield wipers to move a little when you start or shut off the car. By occasionally moving the wipers, they last longer by not getting bent in one position. To change the windshield wipers, press the wiper lever after you shut off the car and they will go up to the service position. They should not be over $50 for a pair at the dealer.

You can't use truck stop high flow fueling nozzles on the mk5 cars. The high flow fueling nozzles are larger and flow much faster to fill a semi's large fuel tank. Because the larger high flow nozzle won't fit in the TDI fuel tank opening, some fuel can splash out. Try to find and use the small diesel nozzles. You may hear of venting or a ventectomy, this does not apply to this generation of TDI.

There's an AC duct in the glove box to direct cool air in there. It works but don't expect chilled champagne. If you need food or medicine to stay cool, get a portable plug in cooler. The knob control is shown with the arrow right. There's also a shelf for your owner's manual that isn't easily visible unless you peer inside there.

I recommend applying a UV-resistant laminate or headlight protector on the headlight lenses. This will prevent pitting and yellowing of the plastic on your new headlights. This is not a VW specific issue because all modern headlights on US cars use DOT approved plastic lenses instead of glass. A paint protecting clear vinyl film over the front of the car is also a good idea but is more expensive than a headlight protector. Professional installation is required and it will prevent chipping of the front. While it does slightly reduce the look of the paint, it's not noticeable at all unless you are closely inspecting it and prevents damage to the paint which is noticeable from a distance. It does not damage the paint at all but cannot be applied to a repainted area or else it can pull off the repainted area.

You may also want to tint the windows. Auto glass blocks UV light but even clear or light tint will block a lot more UV light. Tinting the side windows helps prevent aging of the interior, aging of your skin, adds privacy, and in the event of the window shattering, controls glass particles by holding them to the stick-on film. Tint darkness can come in clear, all the way to dark limo tints, check your local laws for any restrictions. Use only simple soap and water on window tint, never use ammonia based cleaner on the interior of the window where stick-on tint film is applied. Metallic tint will block almost all AM radio reception. The satellite radio antenna and GPS (if equipped) is in the sharkfin antenna on the roof. The regular radio antenna is in the rear window (sedan).
The rear folding seats have a little red indicator tag that is visible if the seats are not "clicked" into the upright normal position. When the seats are secure, the red part of the tag isn't visible. If the seats aren't put upright correctly, it could be dangerous for child seats or the rear passengers, or let trunk contents enter the cabin.

Do not add aftermarket rustproofing since it will void the factory rust warranty. Cars are dipped in anti-rust zinc and have a few layers of paint to prevent rust. While it could still happen and the rust warranty only covers certain kinds of rust, the best thing to do is to wash your car regularly, including the undercarriage. See 1000q: car detailing index for tips on how to avoid scratches and swirl marks from car washing. The best thing to do is to avoid automatic car washes unless they are "touchless".

You can add a backup camera, bluetooth, parallel parking assist, and more to the RNS-510 GPS system. If you do not have the RNS510, you can add it to any 2009 Jetta TDI. See 1000q: RNS 510 FAQ for more info on the touchscreen headunit GPS.

If you missed it earlier, the exhaust diesel particulate particulate filter system can become clogged. Using the correct engine oil will help prevent ash clogging. It's not possible to delete the DPF or remove it without drastic changes to the engine management computers. See 1000q: DPF system FAQ for more details

Exclusive to TDI (not on gas models) is an electric heating strip in the air vent to help warm up the cabin on cold winter mornings. Auxiliary air heater Z35 is inside the climate control assembly and has a 100 amp fuse in the fuse box under the hood. It won't blow hot air but lukewarm air is better than nothing and it will help prevent your frozen breath from obscuring the windshield on super cold mornings.

There are a few reports of paint flaking off the front plastic bumper unrelated to road or parking damage on early A5 TDIs. This is a defect and should be corrected by the dealer. Since the last gen TDIs were made in 2007 (sold as 2006), they should have fixed this issue by now.

The front sway bar (aka anti roll bar) on the TDI is 21mm the rear is 18mm. This is the same as the non GLI Jetta.

Intake valves are 26.6mm, exhaust valves are 26mm.

The minimum wheel size is 15". The front brake rotors are 288mm diameter. The Jetta wagon uses 312mm front rotors and needs 16" wheels.

It's a rare problem, but it's possible for the plastic dust cover on the ignition key slot to jam. Try turning the steering wheel to unlock it and if that doesn't work, try pushing while tilting the key towards the front of the car to push the cover to the side. You could also use a pick. Never lubricate a lock cylinder with wet oil, only use a graphite lubricant.

Transmission issues - A5 body jettas tend to be the most reliable yet, but the 2005.5-2006 models had some issues with the transmissions and flywheel. There is no long term information on the 2009+ Jetta.

Towing is limited to 1000 lbs, 200 lbs tongue weight. The original rating was 1650 lbs but has since been lowered for unknown reasons.

Although the DSG (automatic) transmission (introduced with the 2004 New Beetle TDI) has it's drawbacks, it's still a good automatic compared to previous ones. Shifting is lightening fast and very smooth. However, if you want better mileage and reliability, nothing beats a regular manual transmission. Please read 1000q: DSG FAQ for maintenance, quirks, and other common issues with the DSG transmission. To change the transmission fluid (every 40,000 miles), see 1000q: DSG DIY fluid change. It costs under $150 when doing it yourself but could cost $400-900 at the dealer.

Some people report hesitation from a stop when the car has a DSG transmission. This is reported to be worst when you are stopped, foot on brake, and quickly step hard on the accelerator pedal. This is believed to be from the DSG clutches slipping. To minimize it, after you take your foot off the brake, wait before stomping on the go-pedal hard or gently press the pedal before pressing it harder.

Some early A5 Jetta TDI used defective clutches which were replaced under recall. Some dual mass flywheels (see 1000q: clutch FAQ for more details) failed or decided to liberate themselves from the engine with spectacular results. The flywheel was revised and this should no longer be as prominent.

Super Moderator
23,902 Posts
Discussion Starter #3
Added a note about putting your keys in the trunk. No it didn't happen to me, I just thought about it and decided to add this warning.
1 - 5 of 5 Posts