ENGINE 104, 111, 112, 113, 119, 120, 137, 166 (except 104.98, 112.96, 113.99)

Fig 1: Identifying O2 Sensor Location/Design/Function

O2 sensors, location	Engines 104, 119, 120	GF07.04-P-4103-02F
	Model 163	GF07.04-P-4103-02GH
	Model 168	GF07.04-P-4103-02GC
	Model 170	GF07.04-P-4103-02GS
	Model 202, 208	GF07.04-P-4103-02GR
	Model 203, 209	GF07.04-P-4103-02GT
	Model 210	GF07.04-P-4103-02GQ
	Model 211	GF07.04-P-4103-02T
	Model 215, 220	GF07.04-P-4103-02K
	Model 230	GF07.04-P-4103-02R
O2 sensors, task	Records the residual oxygen in the exhaust gas and sends a signal to the engine control unit. O ₂ -sensors upstream of the catalytic converter: The O₂ -sensor signal is needed for Lambda control Self adaptation of the mixture formation Function chain tests. O ₂ -sensors downstream of the catalytic converter: The O₂ -sensor signal is needed for Two-sensor control and EURO3/4 Monitoring catalytic converter efficiency
O2 sensor design	Finger sensor Engine 104, 111 (except M111 EVO), 112, 113, 119, 120, 137	GF07.04-P-4103-03F
	Planar sensor Engine 111 EVO, 166	GF07.04-P-4103-03GC
O2 sensors function		GF07.04-P-4103-01F
O2-Sondenheizung Function		GF07.61-P-3025F

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

O2 sensors, location/task/design/function - GF07.04-P-4103F: Notes