T8 / P0125 00

Read the instructions below then start the fault diagnostic procedure.

Symptom: Malfunction Indicator Lamp

P0125 00

Fault symptom

Malfunction Indicator Lamp

On-board diagnosis

Type of diagnosis:

Once per driving cycle.

Enable criteria:

Tests 1, 2 and 3.

•	Engine running.

•	A counter accumulates one value for each second which has passed since the engine started (with depressed accelerator pedal, the value is 1 and 0.5 with released accelerator pedal).

•	Start temperature for intake air and coolant have been registered and the lowest of these has been selected.

Fault criteria:

Test 1

•	When the start temperature value is below -7°C, the counter reaches 600 before closed loop starts.

Test 2

•	When the start temperature value is between -7°C and 10°C, the counter reaches 300 before closed loop starts.

Test 3

•	When the start temperature value exceeds 10°C, the counter reaches 120 before closed loop starts.

Dependent:

None

System reaction to a fault:

None

OK report:

Tests 1, 2 and 3.

•	Closed loop active and left 0% before counter runs out.

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

Functions in the diagnostic tool related to the fault:

Test value:

•	Engine Coolant Temperature

•

O2S 1

•	Short Term Fuel Trim

•	Short Term Fuel Trim Status

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