Is it useful to fix just one bad sensor setting off check engine light?

Asked by May 16, 2018 at 03:29 PM about the 2002 Honda CR-V EX AWD

Question type: Maintenance & Repair

I have a 2002 Honda CRV with over 200,000 miles on it and the check
engine codes indicating a bad knock sensor and front O2 sensor heater. I do
not want to replace the O2 sensor due to cost and risk of stripping the
threads, but the knock sensor is a relatively cheap part which I am
considering replacing. I know the engine will run in safe mode sometimes
when the check engine light is on so I'm wondering if just replacing the knock
sensor will have any effect on the engine performance. Or will it continue to
run in safe mode as long as it is detecting the O2 sensor heater failure.

Thanks, any help is much appreciated

2 Answers

109,315

I would replace both if it were me but you should at least do the one.

115,895

O2 sensor heater could also be a blown O2 heater fuse, and the reason (if the fuse is blown) is a shorted O2 heater or wiring. It's rare that a knock sensor will out into low power mode unless there is a short to ground or a bad sensor grounds. If your concerded about threads get some PB Blaster and soak the thing the night before your going to replace it

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