P0521 Code - Engine Oil Pressure Sensor/Switch Circuit Range/Performance

What Does P0521 Mean?

Regarding the P0521 code, it would probably be worthwhile to carefully inspect the wire harness near the intake manifold bracket. This is done most easily from below the car in the area near the oil filter. When you see P0521 engine fault code on your engine code reader this description will help you.

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What are the common causes of P0521 ?

Technicians report that the most common cause of this code comes from lack of engine maintenance. Failure to change your engine oil at regular intervals may result in a low oil level/oil pressure condition. Most engines “burn” at least one quart of engine oil every 3,000-miles. Other causes include a faulty oil pressure sensor, shorted or open wiring in the oil pressure sending unit circuit, and mechanical engine failure.

How do you troubleshoot P0521 ?

If all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector.

Process Tips

Diagnostic trouble code P0521 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before P0521.

Fortunately, P0521 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.



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