Polo throttle line

First: grounding problem.

The grounding problem of engine computer board circuit, there is a computer board output grounding wire, brown wire, in the engine compartment and the lower part of the driving computer board. The ground wire is connected to the body (front left) ground terminal at the lower part of the computer. Disassemble this wire, grind and assemble it, then disconnect the negative battery wire for 5 minutes, and then reassemble and debug it. Troubleshooting should be done. In addition, take a look at the wiring on both sides of the negative line of the battery. 90% are sure to solve the problem.

Second: the oil circuit problem.

Confirm that there is no problem with the oil pump and the oil pump relay, and replace the 404 and 167 oil pump relays if necessary.