O2 Simulators
Registered User
Joined: Feb 2000
Posts: 1,335
From: Cleveland,OH
Just to add to Mr. Chow's lazy answer. 
. 02 sensors are necessary for the PCM, or in your case ECM, to maintain a proper A/F ratio. Sims are used with OBD11, which tell the PCM that the cats are working. They are used when people delete their cats and wish not to have a SES light, or in some cases for E- check which will cause a failure.
. 02 sensors are necessary for the PCM, or in your case ECM, to maintain a proper A/F ratio. Sims are used with OBD11, which tell the PCM that the cats are working. They are used when people delete their cats and wish not to have a SES light, or in some cases for E- check which will cause a failure.
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