o2 simulators
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Teching In
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o2 simulators Ive been having a rough idle and been spitting out 0171 0131 and 1133 codes on my car. ive been told by many people to try replacing my driverside precat o2 sensor. Will putting in a simulator help with that problem or would that be pointless and i should just go with a normal o2 sensor? If its a good idea where can i get a good set?
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From: Schiller Park, ILL Member: #317
O2 simulators are absolutely NOT for use in the pre-cat positions. Simulators are only for use in the post-cat positions, as they give a continually erroneous reading in order to fool the PCM into thinking that cats are present and functioning.
You never want to use a simulator in the front (pre-cat) locations, as they are not actually a sensor. You need a correct and functioning O2 sensor in each pre-cat bank.
You never want to use a simulator in the front (pre-cat) locations, as they are not actually a sensor. You need a correct and functioning O2 sensor in each pre-cat bank.
Thread Starter
Teching In
Joined: Oct 2014
Posts: 48
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O2 simulators are absolutely NOT for use in the pre-cat positions. Simulators are only for use in the post-cat positions, as they give a continually erroneous reading in order to fool the PCM into thinking that cats are present and functioning.
You never want to use a simulator in the front (pre-cat) locations, as they are not actually a sensor. You need a correct and functioning O2 sensor in each pre-cat bank.
You never want to use a simulator in the front (pre-cat) locations, as they are not actually a sensor. You need a correct and functioning O2 sensor in each pre-cat bank.
Staging Lane
Joined: Aug 2014
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Here's a quick rundown of the o2 sensors in your car:
The pre-cat o2 sensors are there to tell the PCM how much fuel is being put into the cylinders vs how much air by reading how much oxygen is in the exhaust. If it sees a lot of oxygen it reads low voltage, if it sees a little, the voltage is higher. This tells the computer to add more or less fuel.
A normally functioning PCM with normally functioning o2 sensors will constantly flip between rich and lean, as the computer is constantly adjusting.
The post-cat o2s are simply there to monitor how efficiently the catalytic converter is working. If it's not there/not working, the PCM illuminates the SES light and gives you a DTC. It is okay to simulate the rears because they do not affect how the car runs.
The pre-cat o2 sensors are there to tell the PCM how much fuel is being put into the cylinders vs how much air by reading how much oxygen is in the exhaust. If it sees a lot of oxygen it reads low voltage, if it sees a little, the voltage is higher. This tells the computer to add more or less fuel.
A normally functioning PCM with normally functioning o2 sensors will constantly flip between rich and lean, as the computer is constantly adjusting.
The post-cat o2s are simply there to monitor how efficiently the catalytic converter is working. If it's not there/not working, the PCM illuminates the SES light and gives you a DTC. It is okay to simulate the rears because they do not affect how the car runs.
