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2007 Ford Freestyle AWD Limited:

My wrench light comes on after car is warm but does not throw any codes. Turn the car off and on wrench light goes away. Put it in any gear after restarting and still warm the light comes back on. When this happens the reverse lights will stay on in any gear. While driving the car runs and shifts great. When warm and shifting from park it shifts hard but shifts smooth when driving. The reverse lights are my biggest concern at the moment.

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When a warning light comes on, there's a code stored in the computer....always. There are generic codes that inexpensive code readers can read and there are manufacturer specific codes that require very expensive professional scan tools. If you didn't use a pro scan tool, that's why you're not seeing the code. Computers don't turn on the light for no reason at all.

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I have a similar issue ('05 base Freestyle), without the reverse lights. It seems to come on consistently during cooler temps - around 60 deg and below. Rarely will it light up in the summer. It's usually after running the engine for a couple of minutes. It stays on for 5 to 15 minutes and goes away. Stopping and restarting usually clears it, but no 100% of the time. The car runs normally without any performance issues. On rare occasions, the light will flicker as I alternating between accelerating (off) and coasting (back on). But the other night, it flickered while I was parked. The biggest reason for replying to this: My Ford dealer had their laptop hooked up to it while the light was lit - no code was thrown. If Ford's own software can't see a code, it makes repairs a bit difficult. The dealer said they could start replacing parts based on their best guess, but fully admitted that wasn't a wise strategy. Without a code, they would know a good starting spot either. While pouring over forums, the throttle body was a popular suspect. I replaced it, retrained the comupter, but still no dice.

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