P0456
EVAP System Leak Detected (Very Small Leak)
1992-1998 BMW 325i E36 2.5L I6 M50 🇩🇪
Low SeverityPowertrain
Description
A very small leak has been detected in the EVAP system. These are the hardest EVAP leaks to find.
Symptoms
- Check Engine Light
- Very slight fuel smell possible
Common Causes
- Gas cap seal worn
- Micro-crack in EVAP hose
- O-ring deterioration
- Charcoal canister hairline crack
- Fuel tank seal degradation
Diagnostic Steps
- Check and replace gas cap first
- Smoke test EVAP system at low pressure
- Inspect all hose connections
- Check canister and all seals
- May need to pressurize fuel tank
Repair Notes
Replace gas cap first. If code returns, smoke test is essential. Very small leaks can be time-consuming to locate.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P0456 on Other Vehicles
Common Questions
What does code P0456 mean on a 1992-1998 BMW 325i E36?
P0456 stands for "EVAP System Leak Detected (Very Small Leak)". A very small leak has been detected in the EVAP system. These are the hardest EVAP leaks to find.
What are the symptoms of P0456 on a BMW 325i E36?
Common symptoms of P0456 include: Check Engine Light, Very slight fuel smell possible.
What causes P0456 on a 1992-1998 BMW 325i E36?
Common causes of P0456 include: Gas cap seal worn, Micro-crack in EVAP hose, O-ring deterioration, Charcoal canister hairline crack, Fuel tank seal degradation.