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Originally Posted By: mehullica
You have a higher than normal level of O2 on your readings. A vacuum leak or lean mixture will raise the O2 levels. Your HC & CO are decent which means you're not having a catalytic converter issue. I think your engine has a small vacuum leak causing a run too hot & fail for NOx. Can you check your O2 readings with a scantool or the obd port with a voltmeter?
Yes, I have an OBD II scanner. What data should I look at?
You have a higher than normal level of O2 on your readings. A vacuum leak or lean mixture will raise the O2 levels. Your HC & CO are decent which means you're not having a catalytic converter issue. I think your engine has a small vacuum leak causing a run too hot & fail for NOx. Can you check your O2 readings with a scantool or the obd port with a voltmeter?
Yes, I have an OBD II scanner. What data should I look at?