Basically I\'m about to purchase a Legacy that I\'ve been in the market for, only thing I want sorted is the check engine light is on. Owner reckons his mechanic tells him the O2 sensor needs replacing. I\'m in two minds over this info ..
I accept that this can cause the check engine light to trigger, BUT, there is a strange ticking noise coming from the engine I think .. Trying to explain here. When we accelerate, it\'s like a light ticking coming from what sounds like behind the dash on the drivers side, but you cannot hear it in the engine bay .. No strange noises coming from the engine bay when revving, both turbo chargers sounds perfect, no engine knocking, nothing. You only hear it when inside driving.
I\'m thinking there is more than just the O2 sensor here .. Knock sensor dramas? Possible pinking (I\'ve never heard of pinking, my father owns a workshop this is what he reckons it could be)? Any other explanations?
Some info on the car:
2001 Legacy Wagon E-Tune
131,000 k\'s
Serviced every 10,000 k\'s since imported according to owner
Manual
No aftermarket pieces whatsoever
Any info from you guys is much appreciated.