Code B0423? | VW Beetle Forum

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1998-2011 New Beetle
2.0 Liter Gas

jerryguyot J Has anybody ever seen a "B" code before? My 1999 NB has been throwing this code for a while now (As well as some others!!) Has not been running all that well lately, so I decided it needed a tune up (92,000 miles and I don't think it had ever been done!) Changed the plugs and wires, cleared all the codes, and is running great........... Drove it about 15 miles and this code popped back up again (As well as P0140) (Still runs great, though!) The P0140 I believe is the Oxygen Sensor? Any ideas if it is the one before or after the Cat? I checked the list, but could not find any "B's" (B0423) Any help is appreciated. Jerry #1 · Nov 11, 2009 Has anybody ever seen a "B" code before? My 1999 NB has been throwing this code for a while now (As well as some others!!) Has not been running all that well lately, so I decided it needed a tune up (92,000 miles and I don't think it had ever been done!) Changed the plugs and wires, cleared all the codes, and is running great........... Drove it about 15 miles and this code popped back up again (As well as P0140) (Still runs great, though!) The P0140 I believe is the Oxygen Sensor? Any ideas if it is the one before or after the Cat? I checked the list, but could not find any "B's" (B0423) Any help is appreciated. Jerry Sort by Oldest first Oldest first Newest first Most reactions #2 · Nov 11, 2009 I just read your problem but dont quote me but check to see if your 02 sensor tube is connected or broken..sounds like a vacuum leak to me.Check all your vacuum lines to see if you can find the problem and the codes go away..i could be wrong but worth a try Insert Quotes Post Reply

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