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2Addicts | BMW 2-Series forum Technical Topics N55 (M235i) Engine, Transmission, Exhaust, Tuning P0420 Code with a catless dp

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      11-21-2014, 06:15 PM   #1
TB///M3
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P0420 Code with a catless dp

Anyone get a P0420 Fault code with a catless downpipe?

I do have a Stage2 JB4 and thought it auto clears that.
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      11-22-2014, 12:45 AM   #2
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Quote:
Originally Posted by BluF22 View Post
Anyone get a P0420 Fault code with a catless downpipe?

I do have a Stage2 JB4 and thought it auto clears that.
Is this the first time it shows up since you install the JB4?
How did you get that code, from the JB4 via USB and JB4 desktop software or OBDII diagnostic tool?
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      11-22-2014, 07:59 AM   #3
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Quote:
Originally Posted by r33
Quote:
Originally Posted by BluF22 View Post
Anyone get a P0420 Fault code with a catless downpipe?

I do have a Stage2 JB4 and thought it auto clears that.
Is this the first time it shows up since you install the JB4?
How did you get that code, from the JB4 via USB and JB4 desktop software or OBDII diagnostic tool?
This is the first time seeing this code after the dp pipe install.
I got an engine light and saw the code on the P3 vent gauge, apparently, it cannot clear that code.
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      11-22-2014, 11:13 PM   #4
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P3 gauge intafear with jb4 probably that's what made this code .. As I heard that p3 gauge and ib4 fight for can bus even make your car run Weird .. U can't have p3 gauge and jb4 together .. Wanted to run that setup as Terry told me that he don't recommend this .. Sell ur gauge ..
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      11-23-2014, 12:21 AM   #5
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@BluF22, try unplug the P3 from the OBDII and see if the JB4 will clear it out.
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      11-24-2014, 02:28 PM   #6
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Thanks for all the suggestions, well, I tried clearing it in config thru P3 gauge multiple times and it didn't clear the code. I was on JB4 map 5 for custom tune, i switch to map 2. Drove for couple of miles and the engine light went away. Not if switching the map actually cleared it, but it's gone now.
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      11-25-2014, 02:47 AM   #7
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Hi,
I have a different code with Catted dp
P013A shown on P3 gauge.
Just like your case, i cant clear away.
I am on JB4 map 5.
It seems that you could clear away after switching to map2.

Maybe you would like to switch to map 5 and see if the code appears again.

cheers
Miguel
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