How to determine if an oxygen sensor signal wire is open or shorted to ground on a system that doesn't use a bias voltage. 2005 Mercury Sable 3.0 with a P2270 trouble code

Engine Performance Diagnostics chapter 5 page 23

symptoms 50

  • check engine light with a P2270 trouble code
  • O2 signal stuck lean

fix 50

  • replace faulty oxygen sensor

test shown enh 50

  • how to force a rich condition to check a stuck lean O2 signal
  • sensor side color review for quick identification
  • how to test oxygen sensor wiring integrity using a test light

Tools used

  • scan tool
  • jumper wire
  • LED test light
  • incandescent test light
  • digital multimeter

end faq

Playlist

(Chapters 4 and 5) Fuel Trim and Oxygen Sensor Testing

Related videos:

How to quickly test an oxygen sensor circuit (GM bias voltage):

What can cause an O2 sensor to read near 5 volts? (Chrysler bias voltage):

O2 sensor circuit testing (a ScannerDanner Premium video):

O2 sensor testing (fixed lean) P0174, P0154, P0155 (Mitsubishi) :

end faq


For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available as an eBook or paper book.

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