P0420 cel
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    Thread: P0420 cel

    1. #1

      P0420 cel

      Purchased my Volvo XC60 T6 over the summer at 72,000 miles. It is at 75,500 now. The check engine light came on for P0420. I was only able to get a reading from one O2 sensor, Bank 1 sensor 2. What should I do? I've read a bunch of issues to this code but no fix. Are the cats still under warranty?

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    3. #2
      Junior Member
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      The catalytic converter is covered under a federal emissions warranty for 8 years or 80k miles. Please let me know if you end up replacing the catalytic converter, I would like to buy your old (broken) one.

    4. #3
      Well, the CEL just cleared itself. I think I will still send it in, I have it scheduled for this Wednesday for Volvo of Seattle.

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    6. #4
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      If they end up replacing the catalytic converter, please ask for the old part back. I will pay you to ship it to me please.

    7. #5
      Member Oceans60R's Avatar
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      Quote Originally Posted by pengc99 View Post
      If they end up replacing the catalytic converter, please ask for the old part back. I will pay you to ship it to me please.
      Cats replaced under warranty have to be turned in and signed off for warranty. Even when they don't have to be turned in there is a core charge on the cat and the tech will be charged if it is not turned in. The core charge has recently been $100-150 but I have seen cores as high as $250. Although, if its warrantied out they will take it regardless.
      Last edited by Oceans60R; 12-18-2016 at 03:16 PM.
      2006 S60 T5 Mystic Silver/Off Black Sport, Factory Body Kit, 18" BBS's, Hilton Stage 2.5, 11 Blade, IPD Intercooler, Green Injectors, OBX 3" DP, Elevate 3" Exhaust, IPD Sways, H&R Springs, R Gauges, Burnouts @45mph
      2008 V8 Sport Passion/Off Black Thai Leather

    8. #6
      Well got checked out all good, looked to be a loose gas cap. No CEL so far. By the way pengc99, I like how you are going to be upgrading your XC60, I will follow your progress on your website.

      Vlad

    9. #7
      Well it came back!! First thing I checked was gas cap. It was secure. Now I'm really puzzled.

    10. #8
      Not surprised the light came back on. I cannot imagine how P0420 could lead to a loose gas cap diagnosis.

      I wonder what the VIDA codes are? Normally, I would go after O2's, then the cat(s). Once the O2 is out, one can put a boroscope in the hole and look at the catalyst material for damage that may require cat replacement.
      2007 S40 T5

    11. #9
      Cleared it self again. Both times the check engine light came on during highway cruise. Last time I was running low on fuel.

    12. #10
      Just got a call from Bellevue Volvo. They said the Cats are bad and ordered new ones under warranty!! Should be installed tomorrow.

    13. #11
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      Please ask and see if you can keep the old parts, I would like to purchase them from you.

    14. #12
      pengc99, the advisor is on break so I couldn't get to him. Tomorrow he should be back and I will ask. But with the new catalytic converter, it seams though I am still getting awful mpg, about 14 on average. Spark plugs were changed recently, cleaned the MAF sensor, what could be the problem here?

    15. #13
      Junior Member
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      Any update? Was it the O2 sensor or the catalytic converter?

      I am getting the same P0420 on my 2011 with 69k miles. Cat is covered under warranty but O2 sensors are not.



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    16. #14
      Could not get the old cats back unfortunately. The cats were replaced, not sure about the o2 sensors but so far no check engine light!

    17. #15
      Quote Originally Posted by pengc99 View Post
      Please ask and see if you can keep the old parts, I would like to purchase them from you.
      Are you still seeking a factory T6 catalytic converter?

    18. #16
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      This Cel came back after going off for about 4500miles.. I don't see a difference in instantaneous mpg, range, smell, driving..could this be an 02 sensor acting up?

      Quote Originally Posted by cory30189 View Post
      Are you still seeking a factory T6 catalytic converter?

    19. #17
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      I've got a spare factory T6 downpipe (incl Cat)...what's the going rate pengc99? :-)
      2014 XC60 T6 - P* Tune, DO88 FMIC, Ferrita DP, TSW Bathurst w/ Conti DWS06, R-Design Suspension, IPD Rear Sway, Custom Exhaust, Morimoto D2S 4.0 HID Projectors, Skeletonized Airbox, Powerflex Bushings, Colder NGK Plugs
      2007 XC90 V8 Sport - IPD Sways/Subframe Inserts/Strut Bar Conversion, Stoptech Rotors
      For Sale: CHEAP! 2007 XC90 V8 Sport Sway Bars / XC60 T6 parts as replaced above

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