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helmut_schulz1

HHR O2 Sensor Error

Got a 2009 Chevy HHR, gasoline engine, 120k km. Check engine light's on, throwing O2 sensor error. MPG's tanked too. Suspect a bad connection at the plug. Anyone else seen this?

Summary of the thread

A 2009 Chevy HHR is experiencing a check engine light due to an O2 sensor error, leading to decreased fuel efficiency. The initial suspicion is a bad connection at the sensor plug. After checking the sensor's resistance and considering the impact of a faulty connection on fuel consumption, it is confirmed that corrosion in the connector was the issue. Replacing the connector resolved the problem.

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4 comment(s)

christianheld76

O2 sensor, huh? Check engine light always makes me nervous! Could be a million things. You sure it's the connection? Did you try cleaning the contacts or anything? Maybe just needs a new sensor?

helmut_schulz1 (community.author)

Yeah, I checked the resistance on the sensor itself, seems within spec. Why would a bad connection cause higher fuel consumption?

christianheld76

Hmm, if the sensor isn't reading right because of a bad connection, the computer probably thinks the air-fuel mixture is off, right? So it dumps in more fuel to compensate? Sounds like a trip to the shop to me, if you're already messing with a multimeter!

helmut_schulz1 (community.author)

Thanks for the input! Turns out it WAS the connector – corrosion. 95€ at the shop for a new one and all is well.

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CHEVROLET

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HHR