Question about 2002 Mitsubishi Eclipse
A rear o2 sensor(s) will be behind....( to the rear ) of the catalytic converter(s) on the exhaust system.
You will most always have a "check engine light" on.
Go and buy a cheap OBD2 code reader at any auto parts store and check the codes yourself.
By law, the plug for the OBD2 terminal has to be with-in 3 feet of the steering column.........just look under the dash area for your post to connect to.
It is just a plug in and read process....very easy.
If you do have a bad rear sensor the code will show on the OBD2 reader.
Posted on Sep 24, 2009
O2 sensors are located on the exhaust pipes
1-2 before the cataltic converters and 1-2 after the cat. converters. 4 cyl engine has 1 before and 1 after. 6 and 8 have 2 before and after mostly) to determine if they are bad it is best left to a repair facility to run a computer diagnostic test routine and or emissions system tests.
Posted on Sep 23, 2009
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Posted on Jan 02, 2017
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The PCM has the ability to monitor this process by using a rear Heated Oxygen Sensor (HO2S 2). The rear HO2S 2, located in the exhaust stream past the catalytic converter, produces an output signal relative to the oxygen storage capacity of the catalytic converter. The PCM then calculates the ability of the catalytic converter to convert the exhaust emissions effectively. Whenever the catalytic converter is functioning properly, the rear HO2S 2 signal will be far less active than the signal produced by the front Oxygen Sensor 1 (O2S 1).
Conditions for Setting the DTC
Action Taken When the DTC Sets
Conditions for Clearing the MIL/DTC
Whenever the oxygen sensor pigtail wiring, connector or terminal are damaged, the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector or terminals. In order for the sensor to function properly, the O2S must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade the performance of the oxygen sensor. Check for the following conditions:
Number(s) below refer to the step number(s) on the Diagnostic Table.
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