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  #1  
Old 07-31-2012, 11:44 AM
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Default P0420 Code, Catalytic Converter

My CEL is on and the code is P0420. Now we ran the OBD2 when the car was running and both O2 sensors seems to be working fine. There is also a squeal on start up and upon acceleration which we do not know if that is linked to the Cat Conv. code. Any thoughts or ideas, has anyone had this code come up and it was a repair that was not directly the Cat Conv? Thanks in advance.
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Old 07-31-2012, 12:24 PM
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I have been reading a lot about vacuum leaks causing the air to be enriched which throws off the sensors. since I think I have a vacuum leak I want to track this down but have had a lot of trouble finding it. Anyone know of common air leaks on these volvos?
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Old 07-31-2012, 01:39 PM
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Generally if you have a vacuum leak it will throw the P0101 code for the Mass Air Flow sensor.
Is your car a turbo or N/A? There's been cracked plastic pipes that are part of the PCV system, old and cracked vacuum lines. Leaks really could be anywhere. Do you have access to a smoke tester? It will pressurize the intake system with smoke so you'd be able to see where the leaks are coming from. If it's a large leak, you'll be able to hear it.

Even though the O2 looked good while connected to the OBDII, it still may actually be a bad sensor. I'd start with the leak test since it's the cheapest option, then I'd look into replacing the rear O2 sensor then go from there.
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Last edited by Mad Matt; 07-31-2012 at 02:30 PM.
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Old 07-31-2012, 05:27 PM
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Ok thank you, and no mine is not a turbo.
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Old 08-02-2012, 08:10 AM
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Could the oil trap/PCV system be malfunctioning. I read where a lot of people were having a whistling sound and the CEL came on. I also hear a high whining sound coming from my engine bay after driving for a while. I am trying to solve this by looking at every angle before jumping in and throwing all new parts in that may not be bad. Thanks.
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Old 08-02-2012, 08:19 AM
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This is all I can see under my intake manifold. This is the oil separator tank, is this the same as the "oil trap"?
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File Type: jpg OilSepTank.jpg (16.4 KB, 22 views)
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  #7  
Old 08-02-2012, 09:14 AM
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Yes, that's the oil trap.

Please try to keep your problems seperate. The car is getting older and many problems may exist.

For the P0420, you may want to try this:

As for the squeeling noise, try to disconnect your serpentine belt and see if the noise goes away. If not, it may be a timing belt roller/idler/tensioner which is real bad news. You'll want to get that taken care of sooner than later. When was the last belt change? Did they also change the rollers?
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Old 08-02-2012, 10:32 AM
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I was thinking that the oil trap was causing the squeal and as I mentioned people were getting CEL when it happened. I wasn't sure if this was the case for mine so I'm trying all this to solve the cat problem, not just randomly posting problems all under one thread. Sorry for the confusion. I may try the lacquer thinner which seems sketchy but it might work. Thanks for the video.

Last edited by rspi; 09-16-2012 at 09:43 AM.
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Old 09-16-2012, 06:13 AM
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Hello

I have 2002 s60 volvo, the check engine light came on, i run test and P0420 came as code, i cleared it check and found exhaust leaking under the car, i have it repaired and the problem has not come until now.can exhaust leak far after the o2 sensors triger the check engine light.
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Old 09-16-2012, 09:45 AM
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I'm not sure but it usually takes about 400 miles for the code to return once reset. The system has to post READY before it will report that code.

BTW, I did try the lacquer thinner trick and had no problem with it.

Last edited by rspi; 09-16-2012 at 09:48 AM.
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Old 09-16-2012, 09:45 AM
 
 
 
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1996, 1997, 850, 960, belt, cat, catalytic, code, converter, p0420, plugged, s60, squeeling, thunderbird, volvo


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