Code Definition

P1158 — Manifold Absolute Pressure sensor out of range

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

About P1158

P1158 is a manufacturer-specific powertrain diagnostic trouble code recorded for Audi 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 (MAP) sensor reports intake manifold pressure to the Engine Control Module (ECM), which cross checks it against throttle angle, engine speed and airflow to confirm it is plausible. DTC P1158 is set when the MAP signal is electrically present but falls outside the expected range for the current operating conditions, meaning the pressure value does not agree with the other load inputs. Unlike a hard open or short, this rationality fault usually reflects a drifted or contaminated sensor, a blocked or leaking vacuum reference, or an actual manifold pressure problem r...

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