Oxygen sensor malfunction

Tiny
FAWIBE OLATUNJI SUNDAY
  • MEMBER
  • 2002 TOYOTA SIENNA
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
The car has check light on got it scanned with codes p1135 and p1155. My mechanic got the sensors replaced p1155 disappeared but 1135 did not.
Saturday, May 20th, 2017 AT 1:23 AM

1 Reply

Tiny
STEVE W.
  • MECHANIC
  • 13,452 POSTS
Both of those codes are for the O2 sensor heater circuit, not for faulty sensors. More than likely there is a broken wire or bad connection in the wiring before it gets to the sensor connectors. The code that went away was probably because the wire break was between the sensor and connector.
To test is simple, disconnect the sensor, connect a test light to the two wires that power the heater and activate the heater circuit. Then follow the wires back to the bad connector or broken wire.
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Saturday, May 20th, 2017 AT 9:20 AM

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