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Discussion Starter #1
Just purchased an AEM system and fitted it yesterday. After a 10 mile drive the check engine light came on. Car runs fine. Is this because the computer hasn't yet figured out that it's now having to cope with more air being sucked in and needs more time to figure it out? Thanks in advance.

It's an '03 Zetec.
 

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Did you unplug the battery when you installed it? Gauges reset when you turned the key back on?
 

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Just purchased an AEM system and fitted it yesterday. After a 10 mile drive the check engine light came on. Car runs fine. Is this because the computer hasn't yet figured out that it's now having to cope with more air being sucked in and needs more time to figure it out? Thanks in advance.

It's an '03 Zetec.
if it was a drop in and installed properly it shouldn't throw a code.

Best bet would be to check the codes and see what the ECU is telling you.
 

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Discussion Starter #5
Thanks guys. The battery wasn't disconnected as far as I know. Someone installed it for me. Going back Mon to have it checked to see which code is showing. Thanks again.
 
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