Operation CHARM: Car repair manuals for everyone.
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A4: Check For O2 Sensor Failure









With the conditions held as A3, suddenly decelerate to idle.

- Has the voltage dropped to 400mV or less?
Yes

GO to A5 A5: Check For O2 Sensor Failure
No
Renew O2 sensor; reconnect plug(s)
GO to A6 A6: Stop