Quote:
Originally Posted by Bob Kontak
You got a P0420? What's your code? Yammering about O2 sensors. Downstream sensor is a common blowout. Minor exhaust leak upstream.
What's your condition?
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I have a very very odd condition. Jetta 1.8T, the ground in the O2 sensor can draw too much current and ruin the ECU. I am on my second ECU, the O2 heater circuit trace burned off the first one.
When the O2 circuit screws up the drive by wire circuit also fails (they share the ground circuit) and then the car is in limp mode...it is totally annoying. The car runs and drives great until the electronics fail.
And a new ECU has to be programmed for immobilizer, but if the O2 sensor isn't right it kills the ECU.
I am on the fence about dumping more money into this car.