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Can someone give me any idea? 2 02 codes now p0420? Scan tool data photos included

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Can someone give me any idea? 2 02 codes now p0420? Scan tool data photos included

 
  #1  
Old 07-11-2019, 01:08 AM
Bananarama
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Can someone give me any idea? 2 02 codes now p0420? Scan tool data photos included

So in March, CEL came on, bank 1 sensor 1. Dealer tossed one in. Perfect.

july 3, p0151 I THINK... it was Bank 2 sensor 1. Dealer tossed one in.

Today, p0420 shows up. Go to a friends shop, he says replace both rear 02s because they just may be on the way out. He said if he was going to do a cat hed do the sensor too.

Im thinking Sensor 1 bank 1 may be bad. Look at the exhaust gas readings! Am I wrong?


Check out the difference between exhaust gases...


 
  #2  
Old 07-17-2019, 09:27 AM
cashcrazy
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I am working on code P0430 for my 2011 3.5 Explorer. I have read everything I can find on this and the first and easiest recommendation I have found is to replace the downstream O2 sensors. I went ahead and replaced both sensors with no change in the code or data. There are a couple of threads online where owners found an exhaust leak within a few inches downstream of the sensor that was triggering the code. I could not find any small cracks or hear an exhaust leak so I had a smoke test performed that didn't find anything. I ordered a new downstream cat and plan to install this weekend. I'll let you know if it works.
 
 


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