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Fault CodeEGR

P0401: Exhaust-gas recirculation flow insufficient

Measured or inferred EGR flow is lower than the controller expects.

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Fault CodeEGR

P0402: Exhaust-gas recirculation flow excessive

The ECU detects more EGR flow than requested, often because the valve is not closing correctly.

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Fault CodeEGR

P0403: Exhaust-gas recirculation control circuit malfunction

The ECU detects an electrical fault in the EGR valve or its control circuit.

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Fault CodeAir metering

P0101: Mass-air-flow signal range / performance

Airflow reported by the MAF sensor does not agree with the ECU's calculated operating conditions.

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Fault CodeTurbocharging

P0299: Turbocharger underboost condition

The engine did not produce the boost pressure requested by the controller.

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Fault CodeTransmission

P0730: Incorrect gear ratio

The gearbox input and output speeds do not match the gear ratio the controller expected.

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Fault CodeTransmission

P0741: Torque converter clutch stuck off / performance

The torque converter clutch is not locking as expected or slip remains too high.

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Fault CodeAir metering

P1101: Intake airflow system performance

Measured intake airflow does not match the ECU model across the expected operating range.

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Fault CodeDPF

P2458: DPF regeneration duration

A diesel particulate filter regeneration took too long or did not complete as expected.

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Fault CodeDPF

P2463: Diesel particulate filter soot accumulation

Calculated soot loading has reached a level that requires diagnosis before normal operation can continue.

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