OXYGEN SENSOR FAILING TO READ, 95 LE SC

  • Tiny
  • sibyllehechtel
  • Member

I have a 1995 Toyota Previa minivan S/C w/ check engine light that's been in the shop numerous times. They see a P0171 code, and we have replaced the MAF and it still hesitates when going up steep hills for a long time ( I live in colorado at 9,300 feet - there's a lot of hills). I Am NOT a competent mechanic -- rather, a non-mechanically inclined woman, but the shop doesn't seem to fix my car.
Could it be the ECU?
How do I find out?

Thanks, sibylle

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Thursday, September 20th, 2012 AT 2:53 AM
  • Tiny
  • rivermikerat
  • Member

Hi Sibylle: Read through the thread. Quite a bit of diagnostic steps have been covered. It appears the culprit for one user here was a simple rubber hose had been worn through.

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Thursday, September 20th, 2012 AT 3:29 AM
  • Tiny
  • smwandtribe
  • Member

I have exactly the same problem, but where do I locate the rubber boot or the bypass valve?

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Thursday, September 11th, 2014 AT 9:32 PM

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