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  • Zmon ·
    Check your vacuum hoses and make sure they're all tight, otherwise, it'd be worth checking into replacing your downstream O2 sensor (The one after the cat). If you have a scanguage or anything of that sort, they can usually tell you if the sensor is performing correctly. It's a pretty general emissions code, it could be the O2 sensor, it could be loose vacuum hoses, or even the cat (though this is unlikely unless it's a cheap aftermarket one or if you have a severe oil burning problem)
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