I have an Audi A3 1.9TDI 2000 (engine AHF - not PD - 110ps) - it's done 233,000 miles (new turbo fitted at 147,000 miles)!
I've been getting inermitent loss of power/turbo over the past month, and a fault code is being generated > 17964 - Charge Pressure Control: Negative Deviation
P1556 - 35-00 - -
A month or so prior to that I was also noticing that the turbo kicks in later e.g 2200revs as opposed to around 1500revs.
I have read through the FAQs and started off by replacing all the rubber vac hoses. I also checked all pipes are connected, cleaned the EGR valve. I've also used VCDS-lite to check the MAF output and also the boost pressure (via Measured blocks function) and in both cases the actual values are matching to expected values. I've also checked the turbo actuator rod and this is ok.
When the problems occures you'll a surge, then power loss - and the car is obviosuly in a limp mode (and dtc 17964 is generated). Switching off/on then seems to reset and power returns.
I can't work out what it is, but the one common thing seems to be that it happens within 5-10mins of a cold start (especially first thing in the morning, such as today when it was 5degree Centigrade.
I'm wondering if a temperature sender somewhere is faulty?
Has anyone else had a similar fault or has any ideas???
Thanks-in-advance.
I've been getting inermitent loss of power/turbo over the past month, and a fault code is being generated > 17964 - Charge Pressure Control: Negative Deviation
P1556 - 35-00 - -
A month or so prior to that I was also noticing that the turbo kicks in later e.g 2200revs as opposed to around 1500revs.
I have read through the FAQs and started off by replacing all the rubber vac hoses. I also checked all pipes are connected, cleaned the EGR valve. I've also used VCDS-lite to check the MAF output and also the boost pressure (via Measured blocks function) and in both cases the actual values are matching to expected values. I've also checked the turbo actuator rod and this is ok.
When the problems occures you'll a surge, then power loss - and the car is obviosuly in a limp mode (and dtc 17964 is generated). Switching off/on then seems to reset and power returns.
I can't work out what it is, but the one common thing seems to be that it happens within 5-10mins of a cold start (especially first thing in the morning, such as today when it was 5degree Centigrade.
I'm wondering if a temperature sender somewhere is faulty?
Has anyone else had a similar fault or has any ideas???
Thanks-in-advance.