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Rear O2 sensor ???????

Old Jan 7, 2011 | 07:42 PM
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mikezohsix's Avatar
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From: granville ma
Default Rear O2 sensor ???????

I'm about to send my ECM out for reprogramming.
If I turn the rear O2 sensors off, will I have a problem with emissions testing?

thx
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Old Jan 7, 2011 | 07:50 PM
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From: CT
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Mike, not sure what the requirements are in MA...what year your car is & what kind of changes you've done.
If they don't do a visual inspection, and the tune is very good, you should pass the sniffer portion of the test, even without the rear o2.
Hello to Granville. We used to hike on the 'mountain(s)' just about every weekend! from CT
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Old Jan 7, 2011 | 08:28 PM
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If the car was/is an OBDII car, then you'll generally need the rear O2.
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