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Smog Check and Rear Oxygen Sensors

 
Old 01-02-2019, 03:57 PM
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crznZ06
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Default Smog Check and Rear Oxygen Sensors

Assuming a car passes the visual inspection, if a car's rear oxygen sensors are deactivated, and its PCM is flashed so no codes are stored and the check engine light is not activated, can it pass a smog check? Thanks.
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Old 01-03-2019, 11:18 AM
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Medrivfast
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If it's a 2000 or newer all they do is plug into the obd2 for smog. Make sure the monitor's are ready to pass
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Old 01-06-2019, 04:28 PM
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dugsgms74
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Originally Posted by crznZ06 View Post
Assuming a car passes the visual inspection, if a car's rear oxygen sensors are deactivated, and its PCM is flashed so no codes are stored and the check engine light is not activated, can it pass a smog check? Thanks.
The only monitor allowed to be "not ready" is Evap so if the O2 monitor can't run and pass then you will fail even if the engine light is off and no codes are stored.
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Old 01-07-2019, 03:17 PM
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PLRX
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They do a visual if there is no codes and the O2 sensors are in place you only have to worry about the "sniff-test". In my 1996 LT4 I failed miserably; It was so bad the report said "GROSS POLLUTER". I bought two new California catalytic converters and I passed. The guy said: "It passed super clean"

Check it out, with those CA crap cats, the car is super lazy and I get less MPG.
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Old 01-09-2019, 09:39 AM
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x2 reaplaced them on my SIlverado it feels like a slug. Prior to that pig used to get wheel hop hitting passing gear with the originals on there.
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Old 01-18-2019, 02:04 AM
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On my ‘02 I don’t have the rear sensors and they’re tuned out. Been though two checks, most recently last January, no issues either time.
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