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
- $100 to $1,500
- 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
P0439 Catalyst Heater Control Circuit (Bank 2) Low
The P0439 code means the computer found an electrical fault in the control circuit of the bank 2 catalyst heater. Fuses, relays, connectors and wiring are the usual cause, so check those before you replace the heater. It does not affect driving, but emissions after a cold start go up.