Cause
Saturated charcoal canister
The canister storing fuel vapour, soaked with liquid fuel and no longer able to adsorb. Overfilling at the pump is the usual cause — topping up after the nozzle clicks off pushes liquid where only vapour should go — so it is a habit as much as a fault, and the replacement will go the same way.
Typically a moderate job.
Codes this can cause (14)
Codes where this is a likely explanation first, rather than merely a possible one.
- P0172 System Too Rich — Bank 1 Likely for this code High
- P0175 System Too Rich — Bank 2 Likely for this code High
- P0132 O2 Sensor Circuit High Voltage — Bank 1 Sensor 1 Moderate
- P0152 O2 Sensor Circuit High Voltage — Bank 2 Sensor 1 Moderate
- P0440 Evaporative Emission System Malfunction Low
- P0441 Evaporative Emission System Incorrect Purge Flow Low
- P0496 Evaporative Emission System High Purge Flow Low
- P0497 Evaporative Emission System Low Purge Flow Low
- P2178 System Too Rich Off Idle Bank 1 Moderate
- P2404 Evaporative Emission System Leak Detection Pump Sense Circuit Range/Performance Moderate
- P2421 Evaporative Emission System Vent Valve Stuck Open Moderate
- P2422 Evaporative Emission System Vent Valve Stuck Closed Moderate
- P2450 Evaporative Emission System Switching Valve Performance/Stuck Open Moderate
- P2451 Evaporative Emission System Switching Valve Stuck Closed Moderate
Information, not instruction
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