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Check engine light does not work

SevMeister
SevMeister
in Ford Fiesta Club

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Would appreciate it if anyone could help or share their experience if they had a similar issue. My MK2 Focus (1.6 TDCI), the check engine light doesn't work. When i turn the ignition on, every light comes on but this one. My car has had faults that would turn it on but never did. However there is a twist. When a SCAN TOOL (Not a basic code reader) is plugged in, it reads all the codes. This means whenever the car has a fault, the MIL light doesn't come on, thus my code reader cant read it.

I did some digging up and there is no electrical tape on the MIL light. The ECM (3A) fuse and other engine management fuses were also replaced and the OBD-II port is fine as my code reader detects the I/M readiness and all other checks. I have a new battery too so can't be any of these.

 

I would really appreciate if anyone has any insights as this is causing a lot of headache for me and is actually really unsafe as i have no clue when something goes wrong until the car sputters or stops working.

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