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2002 Ford Focus

I recently installed a cold sensor to my 2002 ford focus due to it trying to stall out in cold weather. It is still trying to stall out even with the cold sensor what else could be the problem?

If you mean the coolant temp sensor there can be up to three of these on the engine. One for the coolant temp for the indicator on the dash, one for the radiator cooling fan, and one for the computer.

If the problem is with the coolant temp sensor for the computer and you replace the wrong sensor you’ll still have the problem.

Tester

@Tammy49 is the idle rough?
If yes, I’d be concentrating on a dirty throttle body or a faulty idle air control valve.
Check engine light on?
Any stored fault codes?