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check engine light on p0420

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Old 12-06-2010, 09:46 PM   #1
tacowade [OP] tacowade is offline
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check engine light on p0420

CEL on p0420 replaced o2 sensors and cat. Still comes on. What else could cause this?
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Old 12-06-2010, 09:48 PM   #2
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420 huh? Sounds like the Taco wants to smoke some weed.
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Old 12-07-2010, 09:14 PM   #3
tacowade [OP] tacowade is offline
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Cool what

What do u mean? If I could make my truck run on weed it might run better.
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Old 02-09-2011, 08:58 PM   #4
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Did you buy a factory cat and sensor (post cat????) if you bought a aftermarket cat thats why the MIL light comes on. aftermarket just aren't efficient enough for the ecm. buy a factory cat
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