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Originally Posted by xclusivecar
Thanks all for the input...I only lean toward the "its the winter blend" theory because I ONLY need to replace a sensor in the WINTER. Never have I had to replace one in the warmer months. All 4 of mine were replaced last winter...I went the entire spring,summer,fall, with no problems. Winter hits this year and BLAM...I needed a new Cat and after that was replaced another O2 sensor went. Coincidence????
I will try the lower octane stuff in my next tank knowing that it will not hurt the engine...only performance. But thats OK...it is winter and I'm not exactly flying around these Chicago roads!  |
Without really fixing the problem, you'll be back to that mechanic handing him and Porsche more money on unnecessary repairs next winter.
Your problem is most likely an electrical one that only shows up in cold weather due to material shrinkage or electrical property changes.
It could also be one of any number of engine management sensors that's just slightly off.
These are REALLY hard to track down typically, but until you do, that mechanic is going to keep on mindlessly replacing O2 sensors.