Component Tests and General Diagnostics

CO Port Locations:

1. Remove the exhaust sample port bolts and install BMW exhaust adapters 13 0 110 or equivalent at the ports.
2. Run the engine until normal operating temperature is attained (>160°F).
3. Record the exhaust sample readings. Nominal readings (approx. 0.8 ± 0.5)

Fuel Pressure Regulator Location:

4. Stop the engine and clamp the vacuum hose at the fuel pressure regulator.

Oxygen Sensor Connector Location:

5. Disconnect the oxygen sensor connector, which is located at the rear of the engine.
6. Restart the engine.

CO content should be noticeably higher than previously recorded.

7. With the engine running, reconnect the oxygen sensor connector.

CO content should return to previously recorded value (approx. 0.8 ± 0.5).

^ If the correct value is not obtained, verify that there are no fault codes in DME memory.
^ Replace the oxygen sensor .