I'm getting that error on my mustang right now. This seems to be an issue with the TPS (Throttle Position Sensor) It seems in most cases with this error code that the sensor has gone bad and needs to be replaced. Thats my experience with a Ford car any way and it is about a 65 dollar part.
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It is a throttle position sensor fault and is either signal or voltage correlation problem. Replacing the unit should fix the fault and if you consider your mechanic competent enough to do this then by all means give him the job.
should not have to pay for same part twice.take vechicle back to dealership tell them car not fixed you have same problem.let them know you payed them to fix car.same problem still exist.code p2135 problem could be the tps sensor or signal circuit to sensor wires and connector have a short or problem could be throttle body assembly damaged.
Firstly, I must ask: did you take your vehicle to a VW dealership? Did you witness this mechanic connect a scanner to your vehicle's computer to extract any Fault codes? Can you confirm he correctly diagnosed a faulty fuel pump?
Your vehicle is EOBDII compliant, therefore all electronic faults will be immediately stored in the computer and will just require a 15min process to read these codes.
By doing this, you will be able to correctly diagnose the fault and rectify the problem quickly (both fuel pump & speed sensor faults can be quickly identified in this manner).
If you did not take to a VW dealership, then only a garage equipped with the proper EOBD-II (European On-Board Diagnostics V2) scanning tool will be able to communicate with your vehicle's computer.
If in doubt, you should ask to see the code readout for yourself.
If you wish, you can post your codes on here - we will be happy to confirm what the codes mean.
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if you feel confident in using a digital auto test meter. Disconnect the sensor, and check the value range with the test meter to ensure it is within the set parameters.
However, before embarking on that task. Some ECU's will display a fault code, but will require re-setting to clear the code. With a new sensor fitted the ECU should re-set, although some "hold" the code in memory, it does not come up as a visible fault. Some vehicles can be driven a few miles, then the ECU will learn that the new sensor is within specs and will react accordingly.
CODE PO120 - TP SENSOR 1 SIGNAL RANGE PERFORMANCE. CODE P1516 - TAC MODULE THROTTLE ACTUATOR POSITION PERFORMANCE. CODE P2135 - THROTTLE POSITION SENSOR 1 - 2 CORRELATION ERROR. THIS IS A DEALERSHIP FIX YOU HAVE PROBLEMS OR FAULTS IN THE THROTTLE POSITION SENSOR.