Po125 engine lite

Question

Po125 code. Coolant ok. Replaced thermostat twice. Replaced Ect. Replaced no.1 fan switch on thermostat housing. Cleaned maf sensor. Code will not stay off. Comes back on after 2.3 miles.

Answer 1

HI there,

This would indicate either a wiring issue from the ect to the computer, a problem with the computer or low coolant. Any of these would cause the code to continue to come up. I would check the wiring harness from the ect to the computer.