
There are also cases where technicians forget to tighten the filter enough. If it seems like the oil has surpassed its change interval, then it should be changed, along with a new filter.
Oil filter and drain must not be leaking. Check the oil level using a dipstick and make sure there is an adequate amount of oil in the engine.
Faulty connector or wiring in the oil pressure sender circuitĪs said earlier, this code could be a result of a mechanical problem, which means it must be addressed as soon as possible.Ī good starting point in diagnosing this code is with the use of TSB (technical service bulletin) for the vehicle’s specific make and modelĪs with other oil pressure issues, the engine’s oil and levels must be checked first in addressing this code. Old dirty oil (overdue for an oil change). Too high or too low reading on oil pressure gauge. This code could either be mechanical or electrical, but in many cases it points to the latter.Īs with other error codes, this code activates the Check Engine light and registers the code to the vehicle’s memory system. When Error Code P0521 is triggered, that means the PCM has determined an unexpected value in engine oil pressure sender/sensor, which is out of its normal range or could be fixed when it should fluctuate. Sometimes, however, there is no gauge rather, there will be a warning light to notify the driver about the problem. For some vehicles, oil pressure value is relayed to a gauge in the instrument cluster, showing the driver the oil pressure. It relays information through voltage reading value to the PCM. One of these sensors is the ‘Oil Pressure Sensor’ or ‘Oil Pressure Sender’ which detects the amount of (mechanical) oil pressure in the engine. The PCM (powertrain control module, also known as ECM or engine control module in other vehicle makes) is the vehicle’s computer system which controls multiple controls, electronics, and sensors. Specifications on the definition, troubleshooting, and repairs, of course, vary from one make and model to another. It is particularly common among Cadillac, Chevrolet, Dodge, GMC, Mercedes Benz, and Pontiac models. This is a generic trouble code, meaning it applies to all vehicles equipped with OBD-II system, particularly those made since 1996 up to present. Error Code P0521 is defined as Engine Oil Pressure Sensor/Switch Range/Performance.