2002 1.9PD no power, P1556 code.

**Weedraker** · 09-05-2020,11:28 AM

This morning I removed and checked all the charge pipes. They all look ok, and no signs of oil being blown out. I rigged up a pressure tester, blanked off the pipe that enters the inlet manifold and pressurised from the turbo end. The system held pressure very well.
I fitted a different n75 valve with a simplified routing with new pipes from the servo line to the new n75 then to the actuator.
I also swapped the MAP sensor as I had one.
Still the same, no difference at all.
5179B4BA-D275-4F20-B6BB-E7B5E21BB18A.jpg

**Crasher** · 09-05-2020,01:12 PM

Very thorough and very annoying! What are the part numbers of the Thrust sensor in there and the one before?

**Weedraker** · 09-05-2020,02:29 PM

The original one was 036906051C, I cant read the numbers on the one I fitted but it came of a 2003 Octavia 1.9pd and looked identical.

**Crasher** · 09-05-2020,07:03 PM

Well I hope you mean 038 906 051 C, not 036 906 051 C... they make look the same but they aren’t! There are two sensors used in a 2003 Octavia 1U PDTDI, 038 906 051 and 038 906 051 B which changed to D, again these look the same but certainly are not... and are not the same as the 038 906 051 C (Bosch 0 281 002 401 ) if they were that would be stupid of VAG, if they have different part numbers that can be a superseded part number but you should never assume that. Assumption is the Mother of all **** up’s... Incidentally the sensor you need is still available genuine but not from Bosch so it is either genuine or aftermarket.

**Weedraker** · 09-05-2020,10:38 PM

I'll double check part numbers tomorrow, they were from memory and numbers scribbled on a pad by my computer! Do you think the MAP sensor could be the fault? I have what seems to be no boost at all. Many thanks Michael

Edit:-
Part number of the original MAP sensor is 038 906 051 C

**Crasher** · 10-05-2020,12:26 PM

You need a new correct sensor to go any further, ECP have good stocks of the correct (going obsolete) Bosch 0 281 002 401.

**Weedraker** · 14-05-2020,02:05 PM

Hi, The new sensor arrived today, genuine Bosch, fitted it and had a drive, still the same, no power at all.

**Crasher** · 14-05-2020,04:07 PM

No power even from the start? Are you getting the same low boost fault code? To me it sounds like a classic faulty Air Mass Meter.

**Weedraker** · 14-05-2020,07:44 PM

No real power anyware. I just swapped the air flow meter with the one on the girlfriends golf, same part numbers 0 281 002 461.
Still no difference. I cant read the fault codes at the moment, my old computer wont find the port for the cable, I'll hopefully borrow one tomorrow to check the codes.