Description

Function of the GWM P-Series GW4D20M Mass Air Flow (MAF) Sensor

The mass air flow sensor (air-flow meter) sits in the intake duct between the air filter and the turbo, and continuously measures the mass of air being drawn into the engine, sending this reading to the engine ECU. On a diesel the ECU relies on this air-mass signal to control EGR flow, to limit fuelling and smoke under load, and to manage DPF regeneration, so the correct amount of fuel is matched to the air actually entering the cylinders. A faulty or out-of-range sensor can cause loss of power, limp mode, excessive smoke, rough running, poor fuel economy, disabled EGR/DPF functions, and a warning light, because the ECU can no longer trust the airflow it is reading. Fitting a correctly calibrated sensor restores accurate air-mass feedback and proper fuelling.

Common Diagnostic Trouble Codes (DTCs)

A generic OBD reader shows the 5-character code; the GWM system stores the 7-character extended form shown in brackets.

• P0102 [P010200] — air-flow meter open circuit (sensor chip feedback fails)
• P0103 [P010300] — air-flow meter short circuit (sensor chip feedback fails)
• P1104 [P110400] — negative correction too high across full flow range (sensor faulty or wrongly fitted / harness fault)
• P1105 [P110500] — positive correction too high across full flow range (sensor faulty or serious intake leak / harness fault)

Why order it from Partszar

A faulty sensor, coil or starter feeds the engine the wrong signal, so it runs rich, misfires, will not start or drops into limp mode, and the fault light stays on until it is fixed. Once this is replaced the ECU gets what it expects and the vehicle runs the way it did when it was new.

• Fitment checked before it is listed. Every part is cross-referenced against the official parts catalogue and OEM part number so it fits first time. If your vehicle is listed above, this is the one you need. Not sure? Send us your VIN using the contact form below and we confirm the exact part for free, no obligation.
• Dispatched fast, tracked to your door. In-stock parts leave within 1 to 2 business days and reach you anywhere in South Africa in 2 to 5 business days with tracking. Back-order parts are sourced directly from our supplier, typically 3 to 4 weeks, and we keep you updated by email.
• OEM Continental part. Made by the manufacturer that supplies the factory, so it fits and performs exactly like the original.
• Decide with confidence. Selected parts carry our 6-month limited guarantee when fitted by an RMI-approved mechanic. Not sure about anything? Contact us below before you order.

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