Code Definition

P1158 — Manifold Absolute Pressure sensor out of range

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

About P1158

P1158 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 P1158 is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour; 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.

P1158 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

The manifold absolute pressure sensor reports intake manifold pressure to the Engine Control Module (ECM), which compares it against other inputs such as throttle angle, engine speed, and barometric pressure as a plausibility check. DTC P1158 is stored when the manifold pressure reading falls outside the range expected for the current operating conditions, even though the signal may be electrically present. This points to a sensor that is reading inaccurately, a leak at the sensor port, or a genuine manifold pressure problem. Symptoms can include rough running, hesitation, incorrect fuelling, ...

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