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2001 Caravan with p0302 and p0420 codes. Please help

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Old 12-01-2010, 03:29 AM
brianpstults
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Question 2001 Caravan with p0302 and p0420 codes. Please help

My 2001 Dodge Caravan started running poorly after I got gas and the check engine light came on soon after. The OBD codes are P0302 and P0420. I have changed all the spark plugs and plug wires but it still has the problem. Would someone please let me know what steps I need to take next to diagnose the problem and ultimately fix it.
 
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Old 12-01-2010, 05:19 AM
sapporo
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step 1, get a factory service manual this will have the step-by-step procedures to how to diagnose/test/and ultimately repair the problems
step 2, get a real scanner so you can read data of what is causing the codes.
step 3, google search the codes to get info on what they mean. like I just checked for you and a p0420 is a catalyst failure. now you'd need to use testing procedures laid out in the FSM to determine the failure and how to correct. P0302 is a misfire on cyl. #2. so maybe you have a bad wire, bad valve, bad injector, bad rings, bad head gasket, or something like that. that's where a shop manual and scanner can pinpoint the exact problem
 
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Old 12-01-2010, 09:13 PM
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I'd like to see that fuel sample.......
 
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Old 12-01-2010, 09:24 PM
sapporo
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what fuel sample?
 
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Old 12-02-2010, 12:16 AM
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Bad fuel will cause the P0420 code too. Gas mix with Diesel? its always good ideal to get a fuel sample.
 
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Old 12-02-2010, 05:22 PM
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I've seen E-85 do it in a non FFV too.
 
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