Insufficient Coolant Temperature

by Bobby Brockman
(Simpsonville, SC USA)

How do you solve the following codes:

1. Code P0125

2. code P0136

3. code P0171

Steve Says,

The first code that you want to figure out is code p0125. This code could cause the other two codes so you want to get this code fixed first then clear the other two and drive your car and see if they come back.

The first thing you should do is check your coolant level. If it is low it can cause this code to set. The next thing to do is check and/or replace your thermostat. If it is stuck open then your engine will not be able to get warm enough. Another thing that needs to be checked/replaced is the coolant temperature sensor. If it is not giving the correct readings it can cause this problem.

Basically what is probably happening is that your computer is using its default fuel and air mixture (open loop) all the time that is normally used only until the engine is warmed up (closed loop). This is most likely causing the computer to put too much fuel into the engine and causing the other two codes.

If you find yourself scratching your head and just not able to figure it out you can use a service that I highly recommend for diagnostics. It's called JustAnswer and you can get pictures, diagrams, trouble trees, expert advice, etc. Just type your question into the box below. Thanks for asking me your question and please post the fix when you know it. Here is the box: