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
- Medium
- Can I keep driving?
- Yes, but with caution
- Estimated cost
- $40 to $300
- 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
P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) Medium
The P0128 code means the computer measured how long the engine takes to reach operating temperature and found it did not get there in time. In the great majority of cases the thermostat is stuck open or opens too early, so coolant flows to the radiator when it should not yet.