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1999 Subaru Outback Trouble Code PO 135-02 Sensor

Tiny
AQUARIAN4U
  • MEMBER
  • 1999 SUBARU OUTBACK
  • 4 CYL
  • AWD
  • AUTOMATIC
  • 104,000 MILES
Check Engine appears indicating PO 135 Code (Front 02 sensor heater-irregular voltage) only after engine is re-started after initial warm up. When cold and continual usage-No Check Engine Light. Swapped both 02 sensors (Front & rear)(denso brand). Car runs perfect with or without check engine light on.
Some investigations include a potential bad (or shorted) ECM however everything runs just fine. If it was a potential grounding problem, why does check engine light remain off until I shut engine down and immediately re-start while is engine is warm? Perplexing huh? Engine is 2.5 litre A/T Would appreciate your thoughts.

Thanks,

Gordon
Venice FL
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Thursday, September 18th, 2008 AT 6:52 PM

1 Reply

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Check the voltage at the main relay (behind left side of dash) red and yellow/red wires. There are basically 2 relays biuilt into 1 inside that and the o2 sensors are fed power off the yellow/red wire, the red is power into the relay, the relay may be faulty and not giving good voltage consistantly
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Thursday, September 18th, 2008 AT 7:21 PM

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