Question about 1997 Mercury Villager
Code p0744 came up on computer how do I fix the problem
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Posted on Jan 02, 2017
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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