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could be a number of things, need to slef computer check, by turning the key to the on position then off, then on again, then off again, and on but leave it on the thrid time, watch your dit read out where your milage counter is, the codes will flash and when "done" flashes, the computer is done of self check mode. computer will hold codes im memory for a long time, check on web sites for what coades are what, and when fixed, diconnect the battery for about 2 mins to reset the memory of the computer. good luck

To figure out the codes (flashes) when you do that, it will begin by flashing once, wait a second, then flash twice (code 12) that's the beginning of the test. There will be a few second delay between the code numbers. The last one will be code 55 (meaning end of test). Several places have the meaning of the codes but an occassional check engine light is most likely the oxygen sensor. Its rather common. Usually code 21.

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โˆ™ 2011-09-12 07:52:06
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Q: 92 Dodge 350 Van Check engine light comes on sometimes but when motor turned off may not come back on for several weeks Why?
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