ME9 / P0133 00

Read the instructions below then start the fault diagnostic procedure.

P0133 00

On-board diagnosis

Type of diagnosis:

Continuous

Enable criteria:

Engine running.

Closed loop lambda control active.

Requested lambda value is changed periodically.

Current lambda value is measured.

Fault criteria:

Lambda value changed too slowly.

OK report:

Fault criteria NOT fulfilled.

Fault handling:

Type III

(See section Fault handling III, "Other emission-related components and functions" for more information.)

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:

Worn/sluggish/contaminated oxygen sensor.

Functions in the diagnostic tool related to the fault:

Test value:

•	Requested O2S1 Lambda

•	O2S 1 Lambda

•	O2S1 Pump Current

•	O2S 1 Preheating

•	Closed loop lambda control status

•	Closed Loop

•	Total Fuel Trim

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