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2010 XC60 T6 - Eternal P0420

Help, Advice, Owners' Discussion and DIY Tutorials for the groundbreaking new Volvo S60 2011+, V60 2015+ XC60 2010-2018.
slovi1
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Year and Model: 2010 S80 T6
Location: Lockport
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Re: 2010 XC60 T6 - Eternal P0420

Post by slovi1 »

I'll give you a quick update on mine. I think my case is rather unique but I am sure there are others that may have experienced similar situations. I have replaced a lot of the same parts you did but the check engine just kept on coming back. I finally went to a different place and I was told that they have installed an AFTERMARKET Catalytic Converter even though I was charged and was given corresponding paperwork telling me I was given OEM. You can imagine what kind of shocker that news was to me. Basically I was ripped off. I went back to the original place and showed the the pictures, paperwork, etc.... and of course I got a long run around about how they never had any issues with aftermarket converters, to trying to tell me that I agreed to aftermarket converter (with OEM pricing), to something about disgruntled mechanic that did the work and is no longer working for them. Anyways, after long back and forth they gave up and ordered OEM converter and put it in for me while I waited in the lobby watching. It has been 8 months and 8K miles without check engine line. Moral of the store: trust but always verify.
XC60Newb
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Year and Model: 2010 XC60
Location: Denver

Re: 2010 XC60 T6 - Eternal P0420

Post by XC60Newb »

Wow, that is crazy. Glad you got it fixed. Unfortunately for me, it was the Volvo dealership that installed so I would have to assume it was an OEM, but I guess I should still get under and verify.
jenkinskg
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Re: 2010 XC60 T6 - Eternal P0420

Post by jenkinskg »

I have a 2011 xc60 3.2 no turbo
It also have the eternal p0420 error
Changed many things, some of the o2 sensors I bought new give me a new code all together.
New CAT on it now power feels even better, last cat was Magnaflow, worked ok, started codes, then it started to fail at the flex pipe
Got a refund and put a diff replacement on the car now.
Another thing that seems unique about mine is the exhaust manifold only has 1 outlet and no CAT in it.
Most 3.2 I have seen have 2 Ex manifolds with cats in them.


How do I track down cause?
2004 c70 2.3HPT, s60 2.5T
arturos
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Joined: Thu May 14, 2020 12:54 pm
Year and Model: 2010 xc60
Location: detroit

Re: 2010 XC60 T6 - Eternal P0420

Post by arturos »

thx for all the posts, my wife 2010 xc60 t6 , around 90k miles started having this issue, i just keep clearing those codes, our situation is that car was moved overseas to europe and i believe lower octanes 87 might be adding to this issue as using any has type in usa was okey, no errors, will keep checking this thread and update if any findings
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pgill
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Re: 2010 XC60 T6 - Eternal P0420

Post by pgill »

My neighbor had a P0420 on his Toyota and I fixed it about a year ago

Note: I don't own a Toyota, I've never owned a Toyota


Here is what I would do on a Volvo 3.0T with P0420

1. Change the Thermostat (They fail about 10 years or 100K)

2. Change the sparkplugs get the 3459 Denso Iridium Twin Tip FK20HQR8

- if you prefer you can get these in a volvo box (I'll post the part number if you want to go that route)

3. Inspect the coil pack upon removal (if the insulator is burnt or cracked then replace)

4. Use dielectric grease on the top of the insulator for the spark plugs

5. Inspect the old plugs, if the #6 plug is darker than the rest then replace the PCV


Note: the spark plugs I am recommending are what Volvo specified on the 3.0T later in its lifecycle

One last note: change your spark-plugs every 50,000 miles.


As I stated at the beginning of the post I followed the above advice and fixed P0420 on a Toyota, and I did use Denso Iridium Twin Tip Spark-Plugs

Take care

Paul
Dzikiewicz
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Year and Model: 2011 xc60
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Re: 2010 XC60 T6 - Eternal P0420

Post by Dzikiewicz »

Where are you guys buying the OEM cats? From Volvo directly? Or is there a cheaper alternative that will make the codes go away
XC60Newb
Posts: 7
Joined: Wed May 02, 2018 7:35 pm
Year and Model: 2010 XC60
Location: Denver

Re: 2010 XC60 T6 - Eternal P0420

Post by XC60Newb »

Hi All,

Following back up on my original post that started this chain. After giving up, I went in for a Serpentine belt service and the technician noticed that 2 of the 4 studs holding the Cat to the Turbo were missing, and presumed that extra air was coming into the exhaust before the sensors and throwing the code. Super cheap and easy fix, and I got excited that we fixed it. Then, 20 miles later, it came back on.. Unreal.

After doing everything I can possible do, and not being able to find a single professional from a dealership or private service that knows how to fix it, I bought and installed an O2 spacer on the rear sensor to trick the system, then cleared and reset the code and ECU. This light has become the bane of my existence and I didn't want to go this route, but I hate seeing it on and if I ever sell, it will be a difficult explanation and likely a hindrance.

To provide some insight on this method after all my research and lessons, the front sensor is the only one that actual detects and facilitates the adjustment of rich/lean exhaust. The rear does not, in fact, it does nothing other than tell you if your cat/exhaust consistency is working like it should, and even though it communicates with the computer, it DOES NOT influence or facilitate any sort of adjustments, it's just a notification sensor. So, at least from what I've been told by many technicians now, tricking that sensor won't affect anything regardless of what it was, is or will be reading. So, I'm not worried about 'not knowing' if the catalyst/emissions are below efficiency. I must presume they are after everything I've done, and frankly I no longer care as long as the CEL is off. Any problems or cautionary symptoms related to fuel/exhaust will be raised by the sensors that actually matter.

I need to give this thing some time, but will follow up in a while with the success/failure of this.

Updating the list of things I've done:
- Replaced Fuel Cap
- Replaced Fuel Pressure Sensor
- Had Fuel Pump Checked
- Replaced the Front O2 Sensor
- Replaced the Rear O2 Sensor
- Replaced the Catalytic Converter
- Cleaned Fuel Injectors and used Techron for two tanks
- Performed Smoke Test (no leaks)
- Replaced Spark Plugs (checked casings/pack)
- Replaced Air Filter
- Had the PCV Trap and Diaphram Checked (was in good condition/holding strong vaccum, but not actually replaced)
- MAF checked, cleaned
- Reset Battery/ECU
- Fixed and tightened Cat Flange Studs
- Added a Rea O2 Sensor Spacer (1.5")
- I have NOT checked the thermostat as no technicians recommended that. Sounds like if it was an issue, there would be 2 codes, never just P0420.
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RickHaleParker
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Re: 2010 XC60 T6 - Eternal P0420

Post by RickHaleParker »

Check for air leaks. Smoke test the Intake and the Exhaust.
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD.
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
XC60Newb
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Joined: Wed May 02, 2018 7:35 pm
Year and Model: 2010 XC60
Location: Denver

Re: 2010 XC60 T6 - Eternal P0420

Post by XC60Newb »

Already been done, twice. It’s mentioned in the list.
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pgill
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Re: 2010 XC60 T6 - Eternal P0420

Post by pgill »

XC60Newb wrote: Sat Oct 31, 2020 5:32 pm - I have NOT checked the thermostat as no technicians recommended that. Sounds like if it was an issue, there would be 2 codes, never just P0420.
For my 2010 S80 3.2 with the same thermostat as your 3.0T I had no codes and no indication that the Thermostat had failed.

I replaced my Thermostat as preventative maintenance.

I bought the S80 used and I replaced the Thermostat about 1 month after buying it.

Here is what I found when I removed the old Thermostat

Image

Here is what a new Thermostat looks like

The red arrow point at one location that can fail (this failure location is low probability)

The plastic tab that holds the Aluminum bar that keep the spring compressed is the most likely failure point.

Image


For reference I also own a LR2 which has the Volvo 3.2 with the same Thermostat. (I bought the LR2 new in 2008)

I did replace the Thermostat on my LR2 prior to it failing.
But as I was putting everything back together the Thermostat that I removed did break.
So it was going to break soon and it needed to be replaced.

I thought I had changed it unnecessarily but I changed my mind when I found it in pieces on the shelf.

Note: the spacer for the rear O2 sensor is a reasonable solution.

But you should replace your Thermostat when you get a chance

These Thermostats seem to last about 10 years.

Take care

Paul
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