Vehicle speed sensor
SOURCE: 98 mercury villager OBD I code P0135
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.
SOURCE: where is a knock sensor for 1998 Mercury Villager located?
Here is a image of it's location, I hope it helps.
SOURCE: Where is the Vehicle speed sensor located on a
2.0L is on the lower rear of transaxle. 2.5L is on the right side of the transaxle.
SOURCE: Code reader knock sensor where is it located
According to the Haynes manual it is under the intake manifold, Upper and lower intake manifolds must be removed for access. If you go to Auto Zone, they have the sensor and can give you the step by step instructions to replacing the knock sensor with common tools. Good luck and hope this help.
SOURCE: how to replace the speed sensor on a 2000 mercury
Removal & Installation
Vehicle speed sensor location
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