P0520: How to Diagnose & Fix — Engine Oil Pressure Sensor/Switch Circuit Malfunction
21 vehicles · 11 makes · $20-$12,000 repair
How to diagnose and fix P0520: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Porsche 911 · 1999–2008
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.
Common Symptoms
- Metallic debris in oil filter at oil change
- Rumbling or grinding noise from rear of engine
- Sudden catastrophic engine seizure
- Oil analysis showing elevated copper and lead
- Check engine light with oil pressure codes
How to Fix
Replace the IMS bearing with an upgraded ceramic hybrid bearing (LN Engineering IMS Solution or IMS Retrofit). This can be done with the engine in the car during a clutch replacement. On 2006-2008 single-row cars, replacement is strongly recommended as a preventive measure.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- LN Engineering 106-08.40 dual-row IMS Solution kit
1999 Porsche 996 911 and confirmed dual-row 2000-2001 M96 engines; SKU 106-08.40. Identify the actual bearing/engine first, prequalify it and use a qualified Porsche specialist.
- LN Engineering 106-08.20 single-row IMS Solution kit
Confirmed single-row 2000-2005 Porsche 996/early 997 M96 or early M97 engines, SKU 106-08.20. Excludes late non-serviceable 2005 engines and all 2006-2008 large-bearing engines unless the engine is completely disassembled.
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Owner tips & cautions
- WarningCut open the oil filter at every oil change and inspect for metallic debris — this is the earliest warning sign of IMS bearing deterioration.
Sources for this issue (5)
- LN Engineering: Identifying and Fixing the Porsche IMS Bearing Problemmanufacturer
- LN Engineering: IMS Bearing Problem Years in Porsche Boxster and 911manufacturer
- Ferdinand: Porsche IMS bearing failure: settlement reachedmedia
- Wikipedia: Porsche Intermediate Shaft Bearing issuemedia
- Motronix: Porsche IMS Bearing Failure (996/997): A Guide for Ownersmedia
Porsche Boxster · 1997–2008
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.
Common Symptoms
- Metallic shavings in oil filter
- Rumbling noise from engine
- Sudden engine seizure
- Elevated copper/lead in oil analysis
- Oil pressure warning light
How to Fix
Replace the IMS bearing with a ceramic hybrid upgrade (LN Engineering IMS Solution). Best done during clutch replacement to save labor costs. Oil filter inspection at every change is critical for early detection.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- LN Engineering 106-08.40 dual-row IMS Solution kit
1997-1999 Porsche 986 Boxster and confirmed dual-row 2000-2001 engines; SKU 106-08.40. Identify actual bearing and prequalify engine before ordering.
- LN Engineering 106-08.20 single-row IMS Solution kit
Confirmed single-row 2000-2005 Porsche 986/987 engines; SKU 106-08.20. Excludes non-serviceable late-2005 replacement engines and all 2006-2008 large-bearing engines without full disassembly.
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (5)
- LN Engineering: Identifying and Fixing the Porsche IMS Bearing Problemmanufacturer
- LN Engineering: IMS Bearing Problem Years in Porsche Boxster and 911manufacturer
- Wikipedia: Porsche Intermediate Shaft Bearing issuemedia
- Ferdinand: Porsche IMS bearing failure settlement reachedmedia
- IMS Retrofit: IMS Bearing Problem Yearsmanufacturer
Porsche Cayman · 2006–2012
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.
Common Symptoms
- Metallic debris in oil filter
- Rumbling from engine
- Sudden engine seizure
- Elevated copper in oil analysis
- Oil pressure warning
How to Fix
Replace the IMS bearing with a ceramic hybrid upgrade during clutch service. The Cayman mid-engine layout provides the same access as the Boxster for this repair.
Sources for this issue (5)
- LN Engineering: Identifying and Fixing the Porsche IMS Bearing Problemmanufacturer
- LN Engineering: IMS Bearing Problem Years in Porsche Boxster and 911manufacturer
- IMS Retrofit: IMS Bearing Problem Yearsmanufacturer
- Wikipedia: Porsche Intermediate Shaft Bearing issuemedia
- Motronix: Porsche IMS Bearing Failure (996/997): A Guide for Ownersmedia
Dodge Intrepid · 1998–2004
Dodge Magnum · 2005–2008
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P0520 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0520 mean?
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.
What are the most common causes of P0520?
The most common causes of P0520 are: 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). The specific cause varies by vehicle.
How much does it cost to fix P0520?
Repair costs for P0520 range from $20 to $12,000, depending on the vehicle and root cause.
Which vehicles are affected by P0520?
Au7o has documented P0520 across 21 vehicle models from 11 manufacturers: Cadillac, Chevrolet, Chrysler, Dodge, Ford, Jeep, Kia, Land Rover, Porsche, Subaru, Toyota.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.