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help with a check engine light code?

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Old 07-31-2014, 10:59 AM
mrbb1 mrbb1 is offline
Join Date: Jul 2008
Posts: 156
Default help with a check engine light code?

OK, so I have been having issue's with my check engine light coming on after having a new transmission installed in an 06 dodge ram 2500 auto/hemi
Started other tread on this, but since I now have a code number, started it here this way

at my local auto parts store, it would NOT give me a number code, but said 02 sensor issue's

I reset by disconecting battery last time
and now an getting these two codes first I gather is from me disconecting my battery
code # P1684 (batt was disconected)
and then second code is
P0420 catalyst efficency (bank 1)

can anyone tell me what side bank 1 is and if its before or after my cat, as I have 4 02 sensors

my area is emmision controled for state inspections,a nd its a fail if the CEL is on , and my sticker is due to be replaced in Aug
so I need to solve ths

OLD 02's are about 2 yrs old and about 30k or less on them
so there not all that old??
but I know that doesn't really matter, things can go at any time

Thanks, appreciate the help
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Old 07-31-2014, 12:19 PM
cd36c cd36c is offline
Join Date: Jun 2014
Posts: 53

This is why I said it was important to get a code. While P0420 may be a bad O2 sensor, the fact that you just replaced them leads me to believe it is more likely a failed Cat. If you want to read up on that code, here is a good read:
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Old 07-31-2014, 03:08 PM
p38251 p38251 is offline
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Check for pinched wire. A bad o2 sensor can set a cat efficiency code. I have seen wires get pinched during trans swaps.
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Old 07-31-2014, 06:22 PM
mrbb1 mrbb1 is offline
Join Date: Jul 2008
Posts: 156

thanks, I did inspect and checked all wires very well, thinking that maybe one got damaged in the trans install or???
but all are fine

going to replace the drivers side 02 next as I was told bank one is drivers side
so will see if that solves this or not?
Thanks for the help and info
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