P0520 on Porsche
Engine Oil Pressure Sensor/Switch Circuit Malfunction
P0520 on Porsche vehicles indicates engine oil pressure sensor/switch circuit malfunction. Au7o has documented this code across 3 Porsche models — most commonly on 911, Boxster, Cayman. This code indicates a general electrical fault in the circuit for the engine oil pressure sensor or switch. The computer monitors this circuit to know your oil pressure, and it has detected a signal that is missing, shorted, or otherwise out of the expected electrical range. This is typically a wiring or sensor problem rather than an actual loss of oil pressure, but because oil pressure is critical to engine life, it should never be ignored until confirmed. If oil pressure truly is low, serious engine damage can result. Typical repair costs on Porsche range from $1,800 to $4,500, depending on the specific model and root cause.
Common Causes of P0520
- •Faulty oil pressure sensor or switch
- •Damaged, corroded, or loose wiring/connector at the sensor
- •Open or short in the sensor circuit wiring
- •Poor ground connection
- •Low engine oil level or genuinely low oil pressure
- •Failed PCM/ECM (less common)
P0520 on Porsche by Model
Porsche 911(1 issue)
- Intermediate Shaft (IMS) Bearing Failure1999-2008
The IMS bearing on 996 and early 997 flat-six engines is a single-row or dual-row sealed bearing that loses lubrication over time, leading to catastrophic bearing failure and engine destruction. The dual-row bearing (1999-2005) fails less frequently than the single-row (2006-2008), but both are a major concern. This is the most feared and well-documented Porsche defect of the modern era.
Porsche Boxster(1 issue)
- Intermediate Shaft (IMS) Bearing Failure1997-2008
The Boxster shares the M96/M97 engine family with the 911, making it equally susceptible to IMS bearing failure. The sealed bearing loses lubrication and fails, sending metal debris throughout the engine. The 986 Boxster is actually the most commonly affected model due to its production volume and the prevalence of deferred maintenance on lower-priced used examples.
Porsche Cayman(1 issue)
- Intermediate Shaft (IMS) Bearing Failure2006-2012
The Cayman shares the M97 engine with the 911 and Boxster, inheriting the IMS bearing weakness. The 2006-2008 single-row bearing variant is the highest risk. The Cayman R with its 3.4L engine is equally susceptible despite its performance-oriented positioning.
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View P0520 across all makes →Frequently Asked Questions
What does P0520 mean on Porsche?▼
P0520 stands for "Engine Oil Pressure Sensor/Switch Circuit Malfunction." This code indicates a general electrical fault in the circuit for the engine oil pressure sensor or switch. The computer monitors this circuit to know your oil pressure, and it has detected a signal that is missing, shorted, or otherwise out of the expected electrical range. This is typically a wiring or sensor problem rather than an actual loss of oil pressure, but because oil pressure is critical to engine life, it should never be ignored until confirmed. If oil pressure truly is low, serious engine damage can result. On Porsche specifically, this code is documented across 3 models.
What causes P0520 on Porsche vehicles?▼
Common causes on Porsche: Faulty oil pressure sensor or switch, Damaged, corroded, or loose wiring/connector at the sensor, Open or short in the sensor circuit wiring, Poor ground connection, Low engine oil level or genuinely low oil pressure. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0520 on a Porsche?▼
Repair costs on Porsche range from $1,800 to $4,500, depending on the specific model and root cause.
Which Porsche models have P0520 documented?▼
Au7o has documented P0520 on 3 Porsche models: 911, Boxster, Cayman.