P0521 on Peugeot
Engine Oil Pressure Sensor/Switch Range/Performance
P0521 on Peugeot vehicles indicates engine oil pressure sensor/switch range/performance. Au7o has documented this code across 1 Peugeot model — most commonly on 208. This code indicates the engine oil pressure sensor or switch is sending a reading that is implausible or out of its normal operating range — for example, the value doesn't match what the engine's speed and conditions should produce. Unlike a simple circuit fault, this means the signal is present but doesn't make sense (range/performance). It can be caused by a failing sensor, wiring issues, or by genuinely abnormal oil pressure. Because oil pressure protects the engine, a true low-pressure reading should be confirmed and taken seriously.
Common Causes of P0521
- •Faulty or worn oil pressure sensor/switch
- •Low engine oil level or actual abnormal oil pressure
- •Wiring or connector corrosion/damage at the sensor
- •Sludge or debris affecting the sensor reading
- •Use of incorrect oil viscosity
- •Failing oil pump
- •Poor electrical ground
P0521 on Peugeot by Model
Peugeot 208(1 issue)
- PureTech 1.2 Wet Timing Belt Delamination2012-2022
Peugeot confirms that previous-generation 1.0 and 1.2 PureTech engines can experience an oil-pressure issue resulting from premature timing-belt degradation and provides conditional support. Its published terms cover affected 1.0/1.2 non-turbo engines produced June 2012-June 2022 and 1.2 turbo engines produced April 2014-June 2022. The 208 uses a belt, not the timing chain incorrectly named in the frozen solution, and the frozen 150-owner count has no traceable dataset.
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View P0521 across all makes →Frequently Asked Questions
What does P0521 mean on Peugeot?▼
P0521 stands for "Engine Oil Pressure Sensor/Switch Range/Performance." This code indicates the engine oil pressure sensor or switch is sending a reading that is implausible or out of its normal operating range — for example, the value doesn't match what the engine's speed and conditions should produce. Unlike a simple circuit fault, this means the signal is present but doesn't make sense (range/performance). It can be caused by a failing sensor, wiring issues, or by genuinely abnormal oil pressure. Because oil pressure protects the engine, a true low-pressure reading should be confirmed and taken seriously. On Peugeot specifically, this code is documented across 1 model.
What causes P0521 on Peugeot vehicles?▼
Common causes on Peugeot: Faulty or worn oil pressure sensor/switch, Low engine oil level or actual abnormal oil pressure, Wiring or connector corrosion/damage at the sensor, Sludge or debris affecting the sensor reading, Use of incorrect oil viscosity. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0521 on a Peugeot?▼
Repair costs vary widely depending on the root cause and specific Peugeot model.
Which Peugeot models have P0521 documented?▼
Au7o has documented P0521 on 1 Peugeot model: 208.