PO170 code

Tiny
WILLYSJEEP
  • MEMBER
  • 1995 TOYOTA AVALON
  • 3.0L
  • V6
  • 2WD
  • AUTOMATIC
  • 300,000 MILES
Just had the ETC and thermostat replaced to get rid of the PO125 code. Then when driving home twelve miles the engine light comes on new code is PO170. Looked for vacuum leaks but none were evident and the engine is not running rough. Where do I go from here?
Tuesday, June 19th, 2018 AT 6:19 PM

1 Reply

Tiny
STEVE W.
  • MECHANIC
  • 14,122 POSTS
I would start by using a scan tool to actually verify that the fuel trim is out of specification. This code can be from rich or lean fuel trim going outside the limits. However it can be a false code. With live data you can see if the trim is excessive either way. A large vacuum leak or a stuck open injector can both cause it, as can a bad O2 sensor that is telling the PCM to adjust the mix excessively. Check the intake ducting for cracks near the throttle body. If it is a stuck injector it should be running a bit poor.
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Tuesday, June 19th, 2018 AT 7:05 PM

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