Code Definition

P1159 — Mass airflow sensor banks 1 & 2 wrong ratio

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Volkswagen

About P1159

P1159 is a manufacturer-specific powertrain diagnostic trouble code recorded for Volkswagen vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1159 is stored, the module has detected a signal or supply voltage lower than the expected operating range; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1159 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

Vehicles with a V configuration engine use a separate mass airflow (MAF) sensor for each cylinder bank, and the Engine Control Module (ECM) continuously compares the airflow value reported by the bank 1 sensor with the value reported by the bank 2 sensor. DTC P1159 is set when the ratio between the two measured airflow values falls outside the calibrated tolerance window, meaning one bank is reporting significantly more or less air than the other under identical operating conditions. Each MAF sensor uses a heated film element that is cooled by the passing intake air, and the sensor converts th...

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