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Need help with OBD code P0430

Discussion in 'Stock 2011 - 2019 Ford Explorer Discussion' started by Cashcrazy, July 7, 2019.

^^Searches ExplorerForum.com^^





  1. Cashcrazy

    Cashcrazy Active Member

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    2011 Explorer, 108k. The check engine light recently came on my Explorer, code P0430 - Catalyst System Efficiency Below Threshold (Bank 2). After some online the research the easy signs pointed to the downstream O2 sensor on bank two. I replaced both downstream sensors and reset the codes. It threw the code again after a long test drive. My next step was to connect with FORScan. I compared the voltage on both of the downstream sensors and what I noticed was the bank 2 downstream sensor voltage was jumping up and down while the bank 1 downstream sensor was staying fairly consistent during steady highway speeds. Has anyone ran into this same issue or know what the bouncing voltage means? Thanks in advance.
     
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  3. Flying68

    Flying68 Active Member

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    A quick Google search says that it indicates a failure of the catalyst system. Further reading says that if is the only code present, check for exhaust leaks both up and down from the cat. If those are fine the likely cause is an obstructed cat. You have already replaced the O2 sensor.
     
  4. bigdude2468

    bigdude2468 Active Member

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    I would flip the two O2 sensors side to side to confirm that you don't have a bad sensor. Replacing a CAT is expensive, flipping them is easy especially since you just had them out. Remember NEW means "never ever worked"
     
  5. stuarto

    stuarto Member

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  6. Crates

    Crates New Member

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    I recently worked on a vehicle which was throwing the same 0430 code, what I found was a leak due to a fatigue crack in the flex joint just downstream of the oxygen sensor. The crack was small enough that you couldn’t hear it but it allowed air into the exhaust system and it was causing the sensors to flag the 0430 code. Tried welding it but it was practically tin foil so I ordered him a new pipe. Problem solved.
     
  7. peterk9

    peterk9 Staff Member Moderator Elite Explorer

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    Sounds like this issue; 2013 limited front exhaust pipe break (by flex joint), what to do... Member had it fixed at a muffler shop.

    Peter
     
  8. Crates

    Crates New Member

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    I forgot to mention, the exhaust leak would also tie in with the bank 2 sensor voltage bouncing around.

    Let us know what you find.
     
  9. Cashcrazy

    Cashcrazy Active Member

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    Forgive my slow response. For some reason I did not receive the normal email notification for the replies. I had to send it to the shop today for AC work. I will look for a crack in the exhaust pipe when I get it back and post an update. I appreciate everyone’s help with this issue.
     
  10. Cashcrazy

    Cashcrazy Active Member

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    Was this crack between the upstream and downstream sensors or after the downstream?
     
  11. Crates

    Crates New Member

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    On the one I worked on it was ~ an inch downstream from the primary oxygen sensor at the flex joint.
     
  12. Cashcrazy

    Cashcrazy Active Member

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    I looked and listened for an exhaust leak and couldn’t find anything. Does anyone have the service manual with the catalytic converter bolt torque specs? It looks to have six total bolts.
     
  13. KayGee

    KayGee Well-Known Member

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  14. Cashcrazy

    Cashcrazy Active Member

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    I had a smoke test ran on it and no leaks were found. That is ultimately why I decided to replace the catalytic converter.
     

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