QuestionMy wife was driving her 2001 1.8T Jetta (automatic) which has 155,000 klm and all of a sudden it lost power. She was able to make it to the Dealer, it was just up the road. They did a diagnostic check and the codes revealed were:
#1 - 17832 P1424 Bank1 secondardy air system leak detected, sporadic, - Secondary air system leaking
#2 - 17950 P1542 Angle sender 1 for throttle valve drive
-G187 implausible singnal, sporadic,
- Control module replacing;
#3 - 17972 P1564 Throttle valve control part-J338-insufficient voltage during basic settings, sporadic
- Supply voltage
- ECM/throttle valve control module - Adapting,
#4 17965 P1557 Turbo/Super Charger Boost Sensor
(A) Circuit
Value above upper control limit Overboost Condition Control limit exceeded
- Wastegate Bypass Regulator Valve N75
- Charge pressure control system
#5 17705 P1297 Connection charger-throttle valve
Pressure drop
- Connection from turbocharger tothrottle valve leaking
- Consult Technical Bulletin,
#6 17579 P1171 Throttle/Pedal Position Sensor/Switch -B- Circuit
implausible signal, sporadic
-Angle sender 2 for throttle valve drive-G188; and
the 010.02 - Read measuring value block - Display group 32 gave readings of 2.6 % and 17.2%.
Question, could some or most of these readings be present due to the car going into limp mode? if there is such a mode? I ask that because I read somewhere, where someone mentioned limp mode and because the dealer said that when he reset the engine check light and EPC light and took another diagnostic reading that he got fewer fault codes. The dealer checked with their Tech Line and they suggested to check the grouding wiring harness in the engine compartment and also check for any vaccum leaks which they suspect is a scondary problem. The dealer checked the harness and found black corrosion throughout the harness at various connectin points and as farback as they could see without tearing the whole harness apart. The wiring harness here in Canada is $1014.00 CAD. Does changing this wiring harness make sense, do you think it is the route cause to the lost of power and the error codes. After the check engine light and EPC light were reset, I took it for a test drive and it had full power no fault lights came back on, but I did noticed that the RPM was fluctuating up and down between .8K and 1.1K at idle and fluctuated while stationary in drive. Later that day the dealer said the fault lights did come back on? We use synthetic oil and have had the throttle body cleaned several times during oil changes because it gets dirty where the inlet flaper valvue is and causes the RPM to fluctuate. I just recently had that cleaned again. What I do is turn the ingition on and press the gas peddle while the technician at Mr Lube cleans the throttle body.
Any advise would be greatly appreciated.
Please advise.
AnswerHey there Dan. The wastegate bypass being too high could be related to a clogged suction jet pump, my other response says replace the suction jet pump, I still think that's a good idea. Some of the stuff that the dealer told you sounds like a service writers' interpretation of what a good technician told him/her, and they were just trying to make it more understandable to you. No great harm, I suppose, but not the very best possible information. The numbers in the question though, are good things, and give me a lot of information to go on. Like I said in my other response, Thank You for all of this up front, it really helps me to know how to recommend a pathway for you to try. Hope you get this all figured out to your satisfaction. Happy motoring!
