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2002 ford thunderbird check engine code 0340 circuit A Bank 1 how to replace or repair

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You has two (or more) codes.

You listed P0340 which is Cam crank angle sensor.

This is usually cause by motor running hot beyond 230 F

and the heat damaging the cam angle sensor (CAS)


replace the damage CAS

Inspect to make sure the fans are operation

Coolant change to 65/50 mix instead of 50/50
If you're living in sub-zero are then check the coolant bottle for the correct mix.


The front O2 sensors is not providing the data to the computer.

The front O2 (before catalytic is taking a lot more un-burn hydrocarbon and it should change before 85,000 miles.

Poor mileage and slow acceleration will occur if you do not replace the O2s.

Please rate my post id it's helpful to you.



Posted on Dec 12, 2009


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How to fix OBDII CODE: PO 340

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Hi i have a 2002 ford ranger and it has teas codes P0446 P0135 P0141 P2195 P0403 P0171

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Check engine code p0137

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    This code means that the heated circuit in the oxygen sensor on bank 1 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 P0141. See also: P0135 (Bank 1, Sensor 1).

    You will likely notice poor fuel economy the illumination of the Check Engine Light.

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    Internal short or open in the heater element

    Note: Typically a failed catalytic converter does not cause this code. You're more likely to see a P0420 code for a failed converter.

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    Repair short or open or high resistance in wiring harness or harness connectors

    Here is the daignostic procedure for troubleshooting DTC P0141 (click over each image for zoom)...


    Hope this helps to solve it.

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    Well either coincidence that the cam sensor went bad, you forgot to plug in the cam sensor, Or you have the cam that the sensor reads off of 1 tooth off. Check to see if its plugged in if yes remove the upper timing cover and see if everything lines up.

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