P0520 on Hyundai: How to Diagnose & Fix
Engine Oil Pressure Sensor/Switch Circuit Malfunction
1 Hyundai model · 1 documented issue · 1 critical
P0520 on Hyundai by model: symptoms, diagnosis and fix
The 3.8L Lambda V6 in the Entourage is affected by the same connecting rod bearing failure issue that plagued early Lambda engines across the Hyundai/Kia lineup. Manufacturing debris left in the oil passages can restrict oil flow to the connecting rod bearings, causing premature bearing wear and eventual rod knock. Hyundai extended the engine warranty to 15 years/200,000 miles under a settlement. The issue typically manifests between 80,000-150,000 miles with a knocking noise from the lower engine.
Common Symptoms
- Knocking or tapping noise from lower engine
- Noise worsens with engine speed
- Oil pressure warning light illuminated
- Metal shavings in oil during oil change
- Engine seizure (advanced failure)
How to Fix
If the engine is knocking, it requires a replacement engine. Check with a Hyundai dealer for coverage under the extended engine warranty (15 years/200,000 miles). Hyundai will perform an oil consumption test and bearing inspection. Keep all oil change records — they are required for warranty claims. If covered, Hyundai replaces the engine with a remanufactured unit at no cost.
Owner tips & cautions
- TipContact your Hyundai dealer about the extended engine warranty (15 years/200,000 miles) — engine replacement is covered at no cost for affected vehicles
- TipKeep ALL oil change receipts — Hyundai requires proof of regular maintenance for warranty engine replacement
- WarningStop driving immediately if you hear engine knocking — continued driving with bearing failure causes catastrophic rod through the block, voiding the warranty
Sources for this issue (3)
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 on a Hyundai?
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 Hyundai it is documented across 1 model: Entourage.
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 on a Hyundai?
Repair costs vary widely with the root cause and Hyundai model; each issue on this page carries its own estimate where one is published.
Looking for P0520 on a different make?
View P0520 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.