Question about 1998 Mercury Villager

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98 mercury villager OBD I code P0135

Hi
my 98 villager have check engine light with code P0135. So I replaced a sensor ''ensor located before catalytic converter'' After driving little bit the same code came back again.

What shold I do next ? Do I need to change other senor? code still same P0135.
please reply
Thank you in advance

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This code refers to the front oxygen sensor on Bank 1. The heated circuit in the oxygen sensor decreases time needed to enter closed loop. As the O2 heater reaches operating temperature, the oxygen sensor responds by switching according to oxygen content of the exhaust surrounding it. The ECM tracks how long it takes for the oxygen sensor to begin switching. It the ECM determines (based on coolant temp) that too much time elapsed before the oxygen sensor began operating properly, it will set P0135.
Repair short or open or high resistance in wiring harness or harness connectors.
Since you have already changed out your O2 sensor (as long as you used to OEM replacement and not the "Universal" replacement) you should not have to replace it again. You might check your thermostat to part of the time it takes for the O2 sensor to start switching being based on coolant temp, if your thermostat is not operating properly, it could cause the coolant temp to take longer than what is considered by the ECM to be normal.

Posted on Feb 22, 2009

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Http://www.obd-codes.com/p0135
Check out that page. It gives great detail into what should be replaced and what you should look for

Posted on Feb 22, 2009

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