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Old August 22nd, 2013, 07:24 PM
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elwray elwray is offline

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Default Questions about reading codes

I was wondering about reading codes on the EEC IV on my 1990 302.

I understand there are KOEO and KOER codes. But, will a code present in either of these turn on the CEL when the engine is running? Or is that only the KOER codes?

When I turn my key on (but not running the engine) my CEL comes on, and stays on. When the truck is running, the CEL is not on.

Should I bother checking for codes? Could something be there, but wouldn't be triggering the CEL when the engine is running?
Old August 23rd, 2013, 12:15 AM
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The light is on by design when the key is on but not running. It tells you that the bulb works.

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS
Old August 23rd, 2013, 09:05 AM
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Thanks ... I wasn't sure if I was supposed to go out eventually with KOEO.

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