Oxygen Sensor After Catalytic Converter

Oxygen Sensor After Catalytic Converter

Special Tools and Workshop Equipment



- Ring Spanner 7-Piece Set -3337-
- High temperature past -G 052 112 A3-

Removing Left Oxygen Sensor Behind/After Catalytic Converter






- Remove rear engine cover.






- Remove cover -1- in engine compartment (left side).






- Remove coolant reservoir (arrow).

- Disconnect electrical wiring to Engine Coolant Level (ECL) Warning Switch -F66- at bottom of expansion tank.

- Tie coolant expansion tank with connected coolant hoses -1 to 3- to side.

Vehicles with Automatic Transmission



- Disconnect vacuum hose to brake booster (arrows).

All
- Remove heat shield for harness connectors at left of bulkhead, if installed.






- Remove harness connectors -1- to 4- from bracket at left of bulkhead.

- Disconnect electrical harness connector -1-.

- Move wire to oxygen sensor clear.






- Remove oxygen sensor behind catalytic converter (arrow) using special tool -3337/7-.

NOTE:
Illustration is shown with engine removed.

Removing Right Oxygen Sensor Behind Catalytic Converter






- Remove rear engine cover (arrows).






- Remove cover -1- in engine compartment (right side).






- Remove bolts (arrows).

- Disconnect Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- -1- at air guid.

- Remove air guide -2-.






- Remove air filter housing (arrows).






- Remove bolts for holding plates -3- for solenoid valves (arrows).

- Disconnect electrical harness connector at Mass Air Flow (MAF) sensor.

- Remove hose -4- of crankshaft housing ventilation from air guide -2-.






- Remove bolt (arrow) and disconnect air guide -2- at throttle valve control module.

- Disconnect hose -1- from air guide.

NOTE:
Illustration depicts air guide with the removed engine from rear.






- Remove harness connectors -1- to -4- from bracket at right of bulkhead.

- Disconnect electrical harness connector -3-.

- Move wire to oxygen sensor clear.






- Remove oxygen sensor behind catalytic convertor (arrow) using special tool -3337/7-.

NOTE:
Illustration is shown with engine removed.

Installing

Installing is reverse of removal, noting the following:

NOTE:
- Oxygen sensor threads are coated with an assembly paste. This paste must not be allowed to enter the sensor openings.
- Cable ties must always be installed again in exactly the same place to prevent the sensor wire from contacting the exhaust pipe.

Tightening torque: 55 Nm.