AFR stuck at 14.85 - HELP - Mazdaspeed Forums

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AFR stuck at 14.85 - HELP

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12-10-2019, 09:33 AM

#24

C-love

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Originally Posted by Witness

I couldn't tell you. Possibly. When the turbo blew, the O2 sensor still worked for a few weeks. After that, the sensor worked intermittently where it would peg at 14.85 but work normally sporadically.

This leads me to believe you may have a fault in the connectors/wiring for the 02 sensor. I know some people have had issues with the aftermarket O2's, but is it usually a dead reading like you are seeing with static AFR? Probably need to figure out what pins the O2 sensor(s) use on the ECM connectors and test the wiring from the ECM to the O2 connector. If there is a fault there and wiggle tests don't show the issue you may need systematically trace that circuit between the two until you find the fault (assuming you find one on the first place).

Possibly a wiring harness rubbed through on an engine component. I might start looking near hose clamps next to the ECM harnesses as this seems like a common failure point.

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Anaphra (12-11-2019), Witness (12-10-2019)

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