Hi guys, The car has been losing power for some time now, the tachometer fluctuates occasionally (at a constant speed of 50 km/h, it oscillates by 100–200 rpm, stabilizes, and then after 10 seconds it happens again, and so on) and the car stops while driving (right before stopping, the red oil warning light appears, and the engine dies. After that, it won’t start until I disconnect the battery terminal).
I should mention that someone tampered with all the vacuum hoses! Since then, it has no power. I’ve looked for diagrams but cannot find the exact ones for this model. I also have two hoses under the exhaust manifold, and I swapped them around so much that I’m at my wit’s end.
I’ve replaced: the fuel filter, cleaned the EGR and intake manifold, replaced the glow plugs, cleaned the ECU connectors, and the oil pressure sensor.
I’m attaching the VCDS scan:
Audi A3 8L 1.9 TDI ALH 1998 230000km
Chassis Type: 8L - Audi A3/S3 (1997 > 2005)
Scan: 01 02 03 08 15 16 17 22 35 37 45 55 56 57 75 76
* *Mileage: 231110km-143605miles
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Address 01: Engine * * * *Labels: 038-906-018-AGR.lbl
* *Part No: 038 906 018 BB
* *Component: 1,9l R4 EDC * 00AG *1818*
* *Coding: 00001
* *Shop #: WSC 63142*
* *VCID: 57EB8B41861E9A621E1-4B1E
2 Faults Found:
00575 - Intake Manifold Pressure*
* * * * * * 17-00 - Control Difference
00550 - Start of Injection Regulation*
* * * * * * 17-00 - Control Difference
Readiness: N/A
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Address 02: Auto Trans * * * *Labels: 01M-927-733.lbl
* *Part No: 01M 927 733 ES
* *Component: AG4 Getriebe 01M * *3712*
* *Coding: 00000
* *Shop #: WSC 00000*
* *VCID: 055791092C32D8F23CD-0962
6 Faults Found:
00518 - Throttle Position Sensor (G69)*
* * * * * * 16-10 - Signal Outside Specifications - Intermittent
00660 - Kickdown Switch or Throttle Position Sensor*
* * * * * * 27-10 - Implausible Signal - Intermittent
00529 - Engine Speed Signal Missing*
* * * * * * 35-10 - - - Intermittent
00545 - Engine-Transmission Electrical Connection*
* * * * * * 31-10 - Open or Short to Ground - Intermittent
01314 - Engine Control Module*
* * * * * * 49-10 - No Communications - Intermittent
01312 - Powertrain Data Bus*
* * * * * * 49-10 - No Communications - Intermittent
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