What are the symptoms of a faulty oil pressure sensor?
3 Answers
Oil pressure sensor failure can lead to inaccurate detection of oil pressure, resulting in symptoms such as the oil warning light illuminating and the engine malfunction light turning on. When the vehicle's oil is checked and found to be normal, the issue is generally attributed to a faulty oil pressure sensor. Relevant information about the manifold absolute pressure sensor is as follows: Introduction: The Manifold Absolute Pressure Sensor, abbreviated as MAP. It connects to the intake manifold via a vacuum tube, sensing changes in vacuum within the intake manifold as engine speed and load vary. These changes are then converted into voltage signals through alterations in the sensor's internal resistance, which the ECU uses to adjust fuel injection and ignition timing. Working Principle: The intake pressure sensor detects the absolute pressure in the intake manifold downstream of the throttle. It monitors variations in absolute pressure within the manifold based on engine speed and load, converting these into signal voltages sent to the Engine Control Unit (ECU). The ECU then uses this signal voltage to determine the basic fuel injection quantity.
Last time my car had a faulty oil pressure sensor, what a nightmare. First, that little red oil can light on the dashboard kept blinking nonstop, driving me crazy. While driving, the engine noise just didn't sound right - roaring unusually loud. Once on the highway, the temperature gauge suddenly shot up, scaring me into pulling over immediately. The worst part was how it messed with the oil pressure readings - I was genuinely afraid the engine might seize up any day, which would've been disastrous. Later at the repair shop, the diagnostic trouble codes confirmed it was indeed the sensor. Spent over 200 yuan replacing it and everything was fine again. My advice: get it checked immediately if the oil pressure light acts up - don't wait until the engine gets seriously damaged to regret it.
A friend's car experienced this issue before. When he started the car, all the warning lights on the dashboard lit up, and the oil pressure gauge needle was stuck at the lowest position without moving. The most dangerous part is that sometimes sensor failures don't trigger the warning light, so you wouldn't even know if the oil is actually low. While driving, there was a noticeable drop in power, and the engine would roar during acceleration without a corresponding increase in speed. The mechanic mentioned that such problems can easily lead to misdiagnosis—for example, mistakenly thinking the oil pump is broken, resulting in unnecessary repairs. The advice is to immediately turn off the engine and check the dipstick if any abnormalities are noticed. If the oil level is normal, it's most likely a sensor issue.
