Modern engine management relies on a continuous stream of pressure data from the inlet tract to calculate the correct air mass for each injection event. The intake manifold pressure sensor โ sometimes called a MAP sensor โ measures absolute pressure in the inlet manifold and transmits that reading to the ECU, which uses it alongside air temperature and engine speed signals to determine the precise fuel injection quantity and ignition timing. On turbocharged engines, it also provides the ECU with real-time boost pressure information. When this sensor drifts out of calibration or fails entirely, the ECU falls back to substitute values and the engine runs on a fixed fuelling map, typically resulting in poor fuel economy, flat acceleration, and elevated emissions. A hard fault will trigger the engine management warning light and store a corresponding diagnostic trouble code. Because connector type, thread size, and signal voltage range are specific to each vehicle application and ECU variant, the OE reference is the only reliable basis for sourcing a direct replacement. CASCO and MEAT & DORIA both produce extensive ranges of original-quality sensors covering most European applications. Replacement intervals are not prescribed, but MAP sensor failures are common after 100,000 miles on high-mileage petrol and diesel engines.
The OE number for an intake manifold pressure sensor is tied to the ECU variant, connector type, and signal protocol used on your specific engine. Filter by make, model, and engine code using the selectors on this page to see the TecDoc-confirmed OE references for your vehicle. A mismatch in connector pin count or signal voltage range will cause a non-start or permanent fault code, so confirming the OE number before purchasing is essential, particularly on multi-engine model lines where different variants use different sensors.
OEM MAP sensors are calibrated to the exact pressure range and signal curve specified by the ECU manufacturer. Quality aftermarket sensors from CASCO or MEAT & DORIA are produced to the same calibration and connector standards. Generic sensors without an OE cross-reference may have a different signal output curve that the ECU cannot compensate for, leading to persistent fuelling errors, rough idle, or an engine management fault even after fitting. An OE-matched replacement resolves the fault cleanly.
Sustained operation on incorrect fuelling maps can cause issues over time. On turbocharged engines, a failed MAP sensor that causes the ECU to underestimate boost pressure may result in over-enrichment and cylinder wash-down, gradually diluting the engine oil with unburnt fuel. On naturally aspirated engines, the consequences are typically limited to poor running, excess emissions, and failed MOT tests. Either way, a stored MAP sensor fault code should be diagnosed and rectified promptly rather than ignored.
The engine management warning light is usually the first sign, accompanied by a diagnostic trouble code pointing to the MAP sensor circuit. Driveability symptoms include hesitation or flat spots under acceleration, rough idle, higher-than-normal fuel consumption, and increased exhaust smoke on diesel engines. On turbocharged cars, sluggish boost build-up or a boost limit that cuts in at an unexpectedly low pressure are also characteristic. The symptoms often worsen in cold weather when the sensor is most stressed by temperature extremes.
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