How do you fix code p1128 for vw beetle?

The code P1128 stands for "Coolant Temperature Sensor Circuit High Input." This code is triggered when the engine control unit (ECU) detects that the coolant temperature sensor (CTS) is sending a signal that is too high. This can be caused by several issues, including:

- A faulty CTS

- A short in the CTS wiring

- A problem with the ECU

If you are experiencing this code, the first step is to check the CTS. The CTS is located on the engine block, near the thermostat. It is a small, cylindrical sensor with two wires coming from it. Disconnect the wires from the CTS and use a multimeter to test the resistance of the sensor. The resistance should be between 200 and 300 ohms at room temperature. If the resistance is too low or too high, the CTS should be replaced.

If the CTS is not faulty, the next step is to check the wiring. Look for any loose connections or broken wires. If you find any damage to the wiring, repair it and then clear the code.

If the wiring is not the problem, the ECU may be faulty. This is a more serious issue, and it will require the assistance of a professional mechanic to diagnose and repair.

In some cases, code P1128 can also be caused by a low coolant level. If your coolant level is low, add coolant to the reservoir and then clear the code.

If you are unable to fix the problem yourself, you should take your vehicle to a qualified mechanic for diagnosis and repair.