Multi-code OBD2 diagnosis
Enter all the codes your scanner showed, not just the first one. We give you the overall severity, whether you can keep driving, the order in which to check them and how they relate to each other.
Summary
- Overall severity
- Low
- Can I keep driving?
- Yes, no immediate risk
- Estimated cost
- $10 to $350
- Codes analyzed
- 1 of 1
How your codes relate
- EVAP codes do not affect how the engine runs. Start with the fuel cap (it is free) and leave the smoke test for last.
The order below is the recommended one: first the codes that can cause the others. After each repair, clear the codes and check which ones come back.
Order of inspection
P0456 Evaporative Emission System Leak Detected (Very Small Leak) Low
The P0456 code means the EVAP system detected a tiny loss of sealing, equal to a hole of barely a quarter of a millimeter. It is the hardest leak to find in the whole EVAP family and practically requires a smoke test, because nothing shows to the eye and the code often comes and goes for weeks. It does not hurt the engine, so you can keep driving.