Compression Check: Testing and Inspection

Compression, Checking

Special tools, testers and auxiliary items required

• Spark plug removal tool (3122B)

• Ignition coil puller (T40039)

• Torque wrench 5-50 Nm (VAG 1331)

• Compression tester (VAG 1763)

• Adapter (VAG 1381/5A)

Test Conditions

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

• Voltage supply OK.

- Remove the engine cover with air filter. Refer to --> [ Engine Cover with Air Filter ] Engine Cover with Air Filter.

- Disconnect the electrical connectors from the fuel injectors.

- Remove the ignition coils with power output stages. Refer to --> [ Ignition Coils with Power Output Stages ] Service and Repair.

- Remove the spark plugs using (3122B).

- Check the compression using the (VAG 1763) and the (VAG 1381/5A).

• Using tester, refer to --> operating instructions.

- Have a second technician crank the starter.

- Crank the starter until the (VAG 1763) shows no further pressure increase.

Compression Pressure





- To conclude work, erase the Diagnostic Trouble Code (DTC) memory of the Engine Control Module (ECM) since malfunctions were stored by disconnecting the electrical connectors. Refer to --> [ Engine Control Module, DTC Memory Checking and Erasing ] Engine Control Module, DTC Memory Checking and Erasing.