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Discussion Starter #1
sherman from hrm was great in that he drove my car from the shop all the way 2 hours down to my house so that i could have it for my day. 1 hour and 30 mins in to the drive a enging light came on. its code was p424.

any thought.

yes dip stick was all the way in as well as gas cap.

thanks
 

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P0420 Catalyst System Efficiency Below Threshold

running a decat perhaps?

there are many causes for this MIL.
 

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Discussion Starter #5
no decat.... it said bad cat, miss fire, bad o2 sensor, what can i do to find out which on it is?
 

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start reading the threads that discuss MIL # P0420. i'm reasonably certain your problem won't be a new one and will have significant discussion already.

my P0420 was due to a crack in the outlet side of the cat.

use the following to search:

*0420
 
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