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Ford Escape 2006: Engine light keeps coming on

The engine warning light on my 2006 Ford Escape comes on intermittently. My dealer cleaned the throttle body and changed the battery, but the light came on again a week later. This time the dealer made adjustments to the computer, but that didn't work either. I've tried a local garage, but they couldn't fix it. The car surges at light throttle and then becomes sluggish. Other owners relate to the problem with the EGR valve but the dealer and the local garage say the computer does not indicate this fault. I bought the car new and it has 70,000km. It seems no one can come up with an answer. Can you help?

The usual way to detect problems is by using diagnostic equipment to identify the cause, but it's rarely successful when the problem is intermittent. If it's not doing it when the diagnostic gear is hooked up to the car it won't show up. That's the problem you have. Cleaning the throttle body was worthwhile, resetting the computer might have had some effect, the surging at light throttle is probably the best clue to what's happening. Without any guide from the diagnostic gear it becomes a process of trial and error. That it becomes sluggish suggests it's going into limp-home mode as a result of detecting a problem. It could be as simple as a dodgy wiring connection, alternatively it could be a faulty sensor, like a crank angle sensor, or it could be related to the EGR as you have heard. The only way to find the cause is to work through all the possibilities until you find it.

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