2007 Entourage P0420 error code - catalyst bank 1 efficiency threshold - Hyundai Forums : Hyundai Forum
 
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post #1 of 6 (permalink) Old 12-03-2016, 09:26 AM Thread Starter
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2007 Entourage P0420 error code - catalyst bank 1 efficiency threshold

Hello everyone,

This is my first post after a month or so of reviewing forum posts on this issue. I'm at my wits end with this issue.

I have changed both bank 1 and bank 2 downstream O2 sensors since bank 2 side 2 (front of engine) was throwing an error code and a wire was rotted on sensor. I have a VAGCOM software and cable package when I owned several VW's and did a realtime mapping of all O2 sensors. Every one of them seem to be operating and are not stuck on 1.275V (indicates short or open) when engine was at operating temperature. Bank 2 Side 2 exhibited this problem.

I now have this issue, but not have ruled out any other cause. After reading several other posts, a diagnosis of a bad catalytic converter, hole in exhaust between sensors, vacuum leak in Ho2 hoses, etc have not been ruled out.

I would like to ask all of you forum members for assistance and figure out what is next likely area to investigate.
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post #2 of 6 (permalink) Old 12-03-2016, 12:15 PM
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If you monitor the O2 voltage for both sensors on the bank, what you want to see is after driving at a constant speed for a few miles the second O2 will run just below the average high voltage of the first O2. So if you see the first O2 peak around .750v say, then the second O2 when in closed loop and constant throttle should be around .700vs, but not oscillate like the first.

If the two O2s are mimicking each other then the cat is not doing anything.

"Imagine a world in which we are all enlightened by objective truths rather than offended by them." Neil deGrasse Tyson
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post #3 of 6 (permalink) Old 12-03-2016, 06:22 PM
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I had this code on the new-to-me 07 after replacing the engine. During the swap I noticed that the shielded flex pipe between the front bank pipe and the rear pipe was too limp and probably leaking.

A bad flex pipe will allow ambient air to be sucked into the exhaust system and the extra O2 will throw off the downstream O2 sensor.

I bought a new front pipe assembly (Hyundai calls it a "muffler", p/n 28610-4D100) and installed it a couple of weekends ago. Code has not returned.

We see P0420 a lot at work and always look for a bad flex pipe. A local exhaust shop can weld in a new pre-fab flex pipe section and it's a lot cheaper that buying the whole pipe ("muffler") assembly. Not as neat a job, though, and I wanted something that will last as long as I own this van.

Pics tomorrow if I can manage it.
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post #4 of 6 (permalink) Old 12-03-2016, 08:20 PM
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Remove the plastic flex piping between airfilter and engine intake.

Look at it really closely, use you hands to check for small cracks that will allow extra air flow.

This happened on brothers entourage causing multiple o2 codes. Hyundai uses good o2 sensors and they normally last.
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post #5 of 6 (permalink) Old 12-04-2016, 04:20 PM
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Here are some pics of the "muffler" assembly that I replaced.
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post #6 of 6 (permalink) Old 12-04-2016, 05:59 PM
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Oops, forgot the pic of the bad flex joint area and I can't add it to my previous post.
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