My 2001 c70 hp coupe has been throwing this code for a few months now. The indie repair shop found a "cracked hose under the intake to the evaporative valve", replaced hose and ran an evaporative test.
But the shop said the code might come back because of the aftermarket downpipe installed. (ipd`s 3" downpipe with cat and tme`s catback exhaust also from ipd). Then, for 2 months I was code free. But 2 weeks ago it came back...PO422. I can clear it but it comes back in @3 days.
What say you guys? Is my 4 yr old catalytic converter likely at fault, rear oxygen sensor, air/fuel ratio, something else???
I appreciate any suggestions. Thanks.
P0422 Main Catalyst Efficiency Below Threshold (Bank 1)
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foresthump
- Posts: 27
- Joined: 30 December 2011
- Year and Model: C70 2001
- Location: South Boston, Va.
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claymore850
- Posts: 145
- Joined: 28 March 2010
- Year and Model: 850 T5, 244, V70 2.4
- Location: Guatemala
You have to change your catalitic converter and the front oxygen sensor, that s a common problem on the 850 and C70 engines with a few miles on it...
Hi Foresthump
Sorry to hear you having that dreaded code. From what I have read and observed it could be sensors or both the sensors and Catalytic. Some say to change them all at once. It costs a lot of money!
In this day and time we all want to find the best resolution for the problem at the most economical option. I just went through it recently. I have researched on it and have been learning some things from the Volvo experts.
If you have to have one installed and can't do it yourself, please make sure that the mechanic is familiar with Volvo cars. I am learning that many are just not comfortable with Volvos and have even been told that by one man who had a shop for years and won't bother. At least he was honest and I appreciated that.
After a brand new Catalytic Converter was installed at a shop that claimed to be confident and efficient, it made my car run rough as it wasn't done very well.
Aftermarket parts seem to be an issue too, no matter what anyone says. I will be finding out more when I take the car to a Volvo dealer out of town to do a diagnostic after the expensive work was done in my town, that just hasn't made the car drive very well...although it does drive, but rough now. Volvo did an inspection after the Cat was installed and found the turbo flange was not quite flush, but it was too late after the install was done by other people.
I was reading and also saw a video on how one can check the Catalytic Converter for flow and pressure first, by drilling small holes that they plug afterwards. I also read that the type of aftermarket part is important, if that is what you are looking for.
I wish I would have had more time and better people around to ask at the time. Those who have your best interest at heart and respect the car.
That is how I discovered this forum. I will be hanging around to learn. I wish you luck and be careful not to spend money quickly before you know for certain. Possibly there may be other options that will save you money.
Best of luck to you.
Lynn
Sorry to hear you having that dreaded code. From what I have read and observed it could be sensors or both the sensors and Catalytic. Some say to change them all at once. It costs a lot of money!
In this day and time we all want to find the best resolution for the problem at the most economical option. I just went through it recently. I have researched on it and have been learning some things from the Volvo experts.
If you have to have one installed and can't do it yourself, please make sure that the mechanic is familiar with Volvo cars. I am learning that many are just not comfortable with Volvos and have even been told that by one man who had a shop for years and won't bother. At least he was honest and I appreciated that.
After a brand new Catalytic Converter was installed at a shop that claimed to be confident and efficient, it made my car run rough as it wasn't done very well.
Aftermarket parts seem to be an issue too, no matter what anyone says. I will be finding out more when I take the car to a Volvo dealer out of town to do a diagnostic after the expensive work was done in my town, that just hasn't made the car drive very well...although it does drive, but rough now. Volvo did an inspection after the Cat was installed and found the turbo flange was not quite flush, but it was too late after the install was done by other people.
I was reading and also saw a video on how one can check the Catalytic Converter for flow and pressure first, by drilling small holes that they plug afterwards. I also read that the type of aftermarket part is important, if that is what you are looking for.
I wish I would have had more time and better people around to ask at the time. Those who have your best interest at heart and respect the car.
That is how I discovered this forum. I will be hanging around to learn. I wish you luck and be careful not to spend money quickly before you know for certain. Possibly there may be other options that will save you money.
Best of luck to you.
Lynn
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