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ME9 / P2270 00

Read the instructions below then start the fault diagnostic procedure.

Symptom: Malfunction Indicator Lamp

  P2270 00


O2S 2 Signal, Stuck Lean

Fault symptom

Malfunction Indicator Lamp

On-board diagnosis

Type of diagnosis:

Continuous

Enable criteria:

Battery voltage greater than 10.5 V.
Engine running.
Preheating circuit in normal operating range for more than 20 seconds.
Calculated exhaust temperature between 250°C and 800°C.
Fuel level over 12%.
Air mass more than 10 g/s.

Fault criteria:

An extra test is inititated if the O2S 2 signal is less than 650 mV for more than 100. The control module enriches the system with 30% extra fuel. A diagnostic code is generated if the signal does not change after 10 seconds under these conditions.

Checking the wiring harness

Move the wiring harness at several spots and in several directions to reveal intermittent breaks and short-circuits. Check switches, connectors and crimp connections for oxidation, retracted pins and pin clamping force.

Diagnostic help

Diagnosis regards:

Improperly mounted/defective sensor

Functions in the diagnostic tool related to the fault:

Test value:
O2S 2
O2S 2 Preheating

(See also description of readings/activations in diagnostic tool)