Passat (B5) :: 2001 V6 - Check Engine Light On?
Sep 9, 2010
I have had a check engine light on in my car for a while now. I am pretty sure that it deals with the disconnection of the vacuum servo that controls the intake manifold's flaps that designate which track the air takes through the manifold. It has been running fine like this for a while under the assumption that because the performance of the vehicle hasn't changed, there is no need for immediate repair.
Here is my new problem which I am trying to determine if it has to do with the above issue. Over the past few days my car has been giving me EPC and ASR lights along with switching to back-up power. I have been on expressways driving 80, i have been going around corners doing less than 20, and it has happened everywhere in between. Keep in mind that when it happens i slip my car into neutral, pull over, and reboot. After that everything is fine for a short while. I stopped at Auto Zone to get a diagnostic, and for some reason, which i did not feel like questioning due to the way the autozone employee was mentally equipped, they did not give me codes, but descriptions.
(1) Camshaft Positioning Sensor Fault A Bank 1
(2) Camshaft Positioning Sensor Fault A Bank 2
(3) PCM Processor Fault
(4) Running too lean on Bank 1
(5) Running too lean on bank 2.
These are the descriptions for the 5 fault codes. I am planning on stopping back today and getting the proper codes. But would like to get some opinions in the mean time. I've check fuses and relays pertaining to this issue and all have tested ok. Nothing is leaking from my engine and nothing is visibly damaged, except for the vacuum servo arm which is broken (see above paragraph). I feel like the issue is with the ECM (PCM, PCM, ECU, whatever).
Another interesting thing is that when i operate my car using the cruise control, there are no issues what so ever. Possibly an issue with the throttle or its many components?
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Other than that it is a fine car, I'm the second owner, and it was thoroughly maintained at VW dealerships and specialist. Recently there was a new oil pan and starter put in (w/in a month--previous owners).
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Seems to happen when the car is running for a while. Also the ABS light flashes on then off randomly while driving sometimes although It hasn't been an issue. Will be checking tomorrow to see if it starts.
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On Friday, June 3rd, my check engine light went on, I immediately pulled over, checked the dipstick, but all was well. I drove carefully/slowly home since according to the manual it states, "take to dealer."
On Monday, June 6th, I took it to the dealer and paid $110 for a diagnostic fee and was told: "You have a malfunctioning sensor in the tailpipe which is stuck in the open position and it will cost $1500 to replace, wish I had better news for you." I asked what would happen, would I still be able to drive home, would the engine blow up, etc. All the service manager said was, "Well, it will affect the performance of the car and the gas mileage."
As of Friday, June 10th, miraculously the check engine light went off by itself and has not come back on. AND it has NOT affected my gas mileage, I'm getting anywhere between 48-50 mpg, which is what I usually get!
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