Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ECM-P043000

Condition
Engine Control Module (ECM) checks the efficiency of catalytic converter (bank 2) by switching between rich and lean fuel/air mixture. When shifting takes place the signal from the rear heated oxygen sensor (bank 2) is checked and how fast the sensor shifts.
The diagnostic trouble code (DTC) is stored if the engine control module (ECM) registers that the rear heated oxygen sensor (HO2S) switches too quickly and is interpreted as poor catalytic converter efficiency.
The diagnostic trouble code (DTC) can be diagnosed with the engine at operating temperature, approximately 15 minutes after the engine has first been started if the vehicle is driven (normal road load) at 70-90 km/h for 30-40 seconds.

Substitute value
- None.

Possible source
- Installation of the front and rear heated oxygen sensor mixed up.
- Air leakage in the exhaust system.
- Damaged front heated oxygen sensor (bank 2).
- Damaged front catalytic converter (bank 2).

Fault symptom[s]
- Malfunction indicator light (MIL), on