Dummy 02 sensor
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From: Key West, Florida!
Car: 89RSconvtZZ4TPI
Engine: ZZ4TPI
Transmission: 700R4 TRIPP TRANNY
Dummy 02 sensor
I've heard of 4th gen guys using O2 dummy sensors. How do these work. Anyone know?
Tks
Tks
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From: Manassas VA
Car: 04 GTO
Engine: LS1
Transmission: M12 T56
The dummies are for after the cats on OBD2 cars (96-up in f-bodies)
OBD2 uses 2 sets of O2s, one in front of the cats for normal purposes, and one behind the cats to make sure the cats are working properly. If you gut the cats, the second O2s will see it and set a code. Dummies send the 'right' signal to the ecm, thus no code.
OBD2 uses 2 sets of O2s, one in front of the cats for normal purposes, and one behind the cats to make sure the cats are working properly. If you gut the cats, the second O2s will see it and set a code. Dummies send the 'right' signal to the ecm, thus no code.
Thread Starter
Supreme Member
iTrader: (1)
Joined: Jul 1999
Posts: 1,334
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From: Key West, Florida!
Car: 89RSconvtZZ4TPI
Engine: ZZ4TPI
Transmission: 700R4 TRIPP TRANNY
OKay, next question. Seems the ECM likes to see a 600mv before it accepts the o2 sensor as working/not working and allowing the car to go into closed loop. Can you reprogram the chip to make that value like 500mv vs 600mv?
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HoosierinWA
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Oct 7, 2015 10:15 AM
