Compression Check: Testing and Inspection

Compression, Checking






Special tools, testers and auxiliary items required

• Spark plug removal tool (3122 B)

• Puller (T10112)

• Torque wrench (V.A.G 1331)

• Compression tester (V.A.G 1763)

Test Conditions

• Engine oil temperature must be at least 30 °C.

• Voltage supply OK.

• All electrical consumers such as, e.g. lights and rear window heater, must be switched off.

• If vehicle is equipped with an A/C system, it must be switched off.

• For vehicles with automatic transmission, selector lever must be in position "P" or "N".

Perform the following:

- Disconnect the connector - arrow - from the ignition coil.






- Disconnect the connectors from the outer fuel injectors.

- Remove the spark plug wires using the extractor (T10112).

- Remove the spark plugs with spark plug removal tool (3122 B).

- Check compression using compression tester (V.A.G 1763) and adapter (V.A.G 1763/6).

• Using tester => operating instructions.

- Have a second technician operate the starter.

- Operate starter until tester shows no further pressure increase.

Compression pressure:






- Check the engine control module DTC memory and correct any faults. Then erase the DTC memory. Refer to => [ Engine Control Module DTC Memory, Checking and Erasing ] Engine Control Module DTC Memory, Checking and Erasing.