PO170 code

1995 TOYOTA AVALON
300,000 MILES • 3.0L • V6 • 2WD • AUTOMATIC
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WILLYSJEEP
  • MEMBER
  • 1 POST
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?
Jun 19, 2018 at 6:19 PM
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STEVE W.
  • ✓ASE Certified Mechanic
  • 15,200 POSTS
  • ASE Certified Mechanic
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.
Jun 19, 2018 at 7:05 PM
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