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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
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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
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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, K-Pax Exhaust, DO88 FMIC, Ferrita DP, TSW Bathurst w/ Conti DWS06, R-Design Suspension, IPD Rear Sway, Morimoto D2S 4.0 HID Projectors, Skeletonized Airbox, Intake Resonator Delete, Powerflex Bushings, Colder NGK Plugs
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    20. #18
      The CEL is back, same code. Volvo tried to "diagnose" it for $140, ??? what happened to the Volvo service advantage? I denied it and left. Not sure what to do now. I had the three way cat replaced. #36002708

    21. #19
      Member Oceans60R's Avatar
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      Quote Originally Posted by VladN View Post
      The CEL is back, same code. Volvo tried to "diagnose" it for $140, ??? what happened to the Volvo service advantage? I denied it and left. Not sure what to do now. I had the three way cat replaced. #36002708
      If you paid to have a Volvo Dealer replace the catalytic convertor and its still showing bad, there is a lifetime replacement guarantee so they should replace it under parts warranty. And they should have charged you ZERO for diagnosing a CEL.
      An exhaust leak can also cause these faults. I've even seen faulty PCV Oil Separators cause issues. If you have a different dealer you can try, you might go that route or start calling Volvo HQ to complain about your emissions failure.
      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

    22. #20
      The cat was replaced under the federal warranty 8yr/80k. Right now the car is at 85k miles. The cats were replaced at around 78k. I recently (last month) had the PCV replaced because it was making a whistling noise at idle and had air release when you would take the dipstick out while running, the new PCV fixed this problem. But something I may add is that I do have a muffler delete, but the resonator is still there. This was done back in February and I have had zero issues with CEL until now. I probably will give Volvo HQ a call after memorial day.

    23. #21
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      P0420 and P0430 codes

      I have a 09 XC 70 with 3.2
      Long story short, had a misfire ended up replacing all the coil packs and taking it to a 'Volvo specialist' who did software update.
      Anyway, a day later P0420 and 0430 Cat efficiency codes. Both Banks 1 and 2. codes were thrown.
      I tried Cat cleaner
      I read OBD streaming data and voltage on O2-1 and O2-2 which is almost the same, normally indicating a bad cat, but which cat is as there are are two? It seems mighty suspicious that both would fail at the same time. Further my OBD reader is only reading two sensors, Bank 1&2 surely it should be reading 4? Upstream and downstream times 2?
      Anyway is it likely?
      Could in someones experience think something else be going on?
      Could it be as a result that the new software updates have narrowed the perimeters?
      It just seems unlikely that both Cats would fail at the same time.
      Any help would be much appreciated.
      I'm Stumped

    24. #22
      Member Oceans60R's Avatar
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      Since the cat was replaced under warranty and the fault keeps coming back, it is a pre-existing failure while the part was warrantied. If make enough noise, you will be listened to.
      One suggestion I would make is to clear the fault and disconnect the battery and doing a battery reset for 15 minutes. This will clear fuel adaptions. It should have been done after the PCV replacement but you just never know. I've had these cars with PCV issues and replaced them, cleared faults and the CEL would come back on for fuel trim issues. Its not until the adaptions are cleared that the faults stayed out.
      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

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