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
- High
- Can I keep driving?
- Yes, but with caution
- Estimated cost
- $30 to $3,000
- Codes analyzed
- 1 of 1
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
P20EE SCR NOx Catalyst Efficiency Below Threshold (Bank 1) High
The P20EE code means the SCR catalyst is not reducing nitrogen oxides (NOx) the way it should. If it is not repaired, many vehicles limit speed or will not restart after a set number of miles. Start with the DEF quality, the DEF injector and the NOx sensors before you condemn the catalyst.