6.7L Cummins Forum

P2A00-O2 SENSOR 1/1 CIRCUIT PERFORMANCE
The engine aftertreatment system monitors the O2 content in the diesel engine exhaust. The ECM monitors the exhaust gases for oxygen content and varies the rich/lean fuel mixture of the intake air fuel mixture to adjust the system. This diagnostic checks to make sure that the O2 content matches the expected O2 content for the engine operating conditions. The ECM will set the fault if it detects that the actual O2 measurement does not match the expected value. The ECM will illuminate the MIL lamp immediately when the diagnostic runs and fails. The ECM will turn off the MIL lamp diagnostic runs and passes in four consecutive drive cycles.

• When Monitored: This diagnostic runs when the engine is running.
• Set Condition: The ECM will set the fault if it detects that the actual O2 measurement does not match the expected value.

Possible Causes
UNDETECTED OVER OR UNDER FUELING OR AIR HANDLING ISSUES
EXHAUST SYSTEM LEAK
EGR SYSTEM LEAK
O2 SENSOR 1/1 FAILED IN-RANGE
MASS AIR FLOW SENSOR FAILURE
ENGINE MISFIRE



P2A01-O2 SENSOR 1/2 CIRCUIT PERFORMANCE

The engine aftertreatment system monitors the O2 content in the diesel engine exhaust. The ECM monitors the exhaust gases for oxygen content and varies the rich/lean fuel mixture of the intake air fuel mixture to adjust the system. This diagnostic checks to make sure that the O2 content matches the expected O2 content for the engine operating conditions. The ECM will set the fault if it detects that the actual O2 measurement does not match the expected value. The ECM will illuminate the MIL lamp immediately when the diagnostic runs and fails. The ECM will turn off the MIL lamp diagnostic runs and passes in four consecutive drive cycles.

• When Monitored: This diagnostic runs when the engine is running.
• Set Condition: The ECM will set the fault if it detects that the actual O2 measurement does not match the expected value.

Possible Causes
UNDETECTED OVER OR UNDER FUELING OR AIR HANDLING ISSUES
EXHAUST SYSTEM LEAK
EGR SYSTEM LEAK
O2 SENSOR 1/2 FAILED IN-RANGE
MASS AIR FLOW SENSOR FAILURE
ENGINE MISFIRE

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2007.5 Dodge Ram 3500 HD,QC, 6.7L Cummins, 6speed Auto, 4X4, Bighorn Edition.
Click for installs: Carr Steps PML Diff Cover Edge Juice with Attitude Volant Intake Hankook ATM RF10