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Replaced O2 sensors cannot clear codes

Tiny
BARENNA12
  • MEMBER
  • 2009 MAZDA 6
  • 3.6L
  • V6
  • 2WD
  • AUTOMATIC
  • 189,000 MILES
I replaced the O2 sensors, but cannot clear the error codes in the ECU. I tried 'clear codes' using a diagnostic tool and I tried disconnecting the battery and draining it. The codes remain in the ECU without starting the car up.
Thursday, November 16th, 2017 AT 8:22 AM

2 Replies

Tiny
PATENTED_REPAIR_PRO
  • MECHANIC
  • 1,853 POSTS
If you cannot clear the codes, then most likely that means that replacing the O2 sensors did not fix the problem. Error codes do not always mean a sensor is bad, it just refers to the circuit, so it could be a problem with the circuit wiring.
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Thursday, November 16th, 2017 AT 2:06 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,414 POSTS
What are the actual codes you have? What tool are you using to clear them?
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Thursday, November 16th, 2017 AT 2:18 PM

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