Smog Check and Rear Oxygen Sensors
01-02-2019, 02:57 PM
#1
Racer
Thread Starter
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.
01-06-2019, 03:28 PM
#3
Burning Brakes
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.
01-07-2019, 02:17 PM
#4
Team Owner
Member Since: Aug 2005
Location: Riverside County Southern California
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Co-winner 2020 C4 of the Year - Modified
2018 Corvette of Year Finalist
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St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16-'17-'18-'19-'20
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.
Check it out, with those CA crap cats, the car is super lazy and I get less MPG.
01-09-2019, 08:39 AM
#5
Team Owner
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St. Jude Donor '05
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.
01-18-2019, 01:04 AM
#6
Melting Slicks
Member Since: Aug 2006
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St. Jude Donor '08-'09-'10-'11-'12-'13, '15,'21
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.