ME9 / P0138 00

Read the instructions below then start the fault diagnostic procedure.

P0138 00

On-board diagnosis

Type of diagnosis:

Continuous

Enable criteria:

Battery voltage must be between 10 - 18 V.

Engine running.

Exhaust temperature below 800°C.

Sufficiently warm sensor.

Fault criteria:

When input voltage exceeds 1.08 V for more than 5 seconds.

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:

Electrical fault in connecting leads or component.

Functions in the diagnostic tool related to the fault:

Test value:

•

O2S 2

•	Closed Loop

•	Closed loop lambda control status

•	Total Fuel Trim

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