Ambient temperature sensor reading too high

[korisnik]

Hi everyone,

I have a 2009 Ford Fiesta. Recently, I programmed the trip computer and installed a new ambient temperature sensor. However, I’ve noticed that the reading on the trip computer (the small display on the instrument cluster) is almost always 10°C or more higher than the actual ambient temperature.

The reading is off even before I start the car, so it’s not related to engine heat. The sensor itself is installed behind the front bumper.

I know there are already some topics about this on the forum, but I haven’t found a clear answer yet. Has anyone experienced something similar? Is it possible to calibrate the measurement somehow, or is there anything I should check? I tried resetting it by holding the AC button and the recirculation button for 3 seconds, then pressing AC again, but that didn’t do anything.

Also, I’m not sure if there are different types of ambient temperature sensors for the Fiesta. Mine has the code: 6M5T-10K936-AB.

Any advice would be greatly appreciated!

 

[Handy Andy]

Sadly most of the older car ambient temperature sensors were not a priority stock item that people kept in stock at various dealers and shops, so the technology that made them work has moved on.

Can you get to a wreck yard and possibly pull one from another Ford of the same years span - they would work for they used these sensors across that years (era of model and make before they re-intro'd the line as new and improved) so that technology might still work - it's cheaper and would also, by year - be more compatible than to try and use a newly revised part that fits the connector but doesn't give you the proper reading even though it should.