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
P0455 Evaporative Emission System Leak Detected (Large Leak) Low
The P0455 code means the EVAP system could not hold pressure or vacuum during its test, and the loss was big enough to equal a hole about 1 millimeter or larger. In practice that almost always means something obvious: a gas cap left loose or on wrong, or a hose that came off. You can keep driving, but fuel vapor is escaping, so fix it soon.