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2000 Volvo V70 XC--Check Engine Light!

Help and Advice on Volvo's extremely popular car line, powered by Volvo's nearly indestructible, versatile inline 5-cylinder engine.
1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
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1997 - 2000 V70-XC
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2000 Volvo V70 XC--Check Engine Light!

Postby adk793 » 23 May 2010, 10:20

After doing a lot of driving today, both high and low speeds, my check engine light went on. Yes, the guy driving my car did some pretty hard accelerations. Anyways, i used my OBDII scan tool and it read P0422--Catalyst System Low Efficiency Bank 1. The car has only 95K miles on it. Although there can be many things that could have went bad, what is the most common failure with this code/issue. Do a need a new Cat converter, or what!

The car has been maintained decently well...recently replaced the front brakes, timing belt, water pump, cam shaft position sensor, oil sump rings, etc.......long story short its been costing me a lot. I really don't have the money for it right now but will have to pay if its that urgent.

I reset the check engine light, drove around the block a few times and it was good. But if i ignore this, can this lead to other future failures, or cause problems. Or can i keep driving and keep resetting the light.

BTW, the car runs well without any problems with the code on.
It went on right after my friend basically floored it. What could this be related to---and if it was to go back on, how long/how many miles will it take.
I love my volvo just so many problems!
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Re: 2000 Volvo V70 XC--Check Engine Light!!

Postby ecbsykes » 23 May 2010, 14:21

I have essentially the same car as you, and had exactly the same problem. My car has been run probably about 80% highway in its 140,000 miles, so good conditions for the cat.

I reset my code, had it come on 200 miles later, reset again, and now I haven't seen it for over 1000 miles (knock on wood). It can be caused by something not burning right that fouls the converter temporarily. If you overdo certain fuel additives you could get a code like that because the cat isn't happy. Burning oil would be another, but I think you would know about that.

You mentioned your friend gave it a good push.... make sure all vacuum lines are where they should be. From what I've seen in the forums, there are a lot of things that could cause this to go off. But unless the car has been seriously abused in its past, there is very little chance that your cat converter is dead at less than 100K.
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Re: 2000 Volvo V70 XC--Check Engine Light!!

Postby JRL » 23 May 2010, 14:49

Converter, 02 sensor(s) or both
100K means nothing.
My 2000 V70 R had a new Cat and 02 sensors installed at 45K miles!
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2006 XC70 White only 59,000 miles. New daily driver.
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Re: 2000 Volvo V70 XC--Check Engine Light!!

Postby jblackburn » 23 May 2010, 16:06

Reset the light for now, and as ecb said, see if it comes back again.

I've had things pester me for a while, and then shut up altogether after a few renditions (like the useless MAP sensor).

If it comes back persistently, you may just need a new rear O2 sensor.
'98 S70 T5 218K miles
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Re: 2000 Volvo V70 XC--Check Engine Light!!

Postby adk793 » 23 May 2010, 16:17

How would i check vacuum hoses for proper function?? Is there a diagram for the engine that would show me?

In response to the second post, off-course anything can go wrong(pre-maturely) at anytime. Im just trying to get a general sense of the likelihood of it happening.

Now if it is the Cat converter, would it damage like the O2 sensors if i let the problem be...and likewise, would bad O2 sensors do something bad to the Cat conv.

Ive done some maintenence/repairs on the car. Is this something i can do myself if i would have to change something?
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Re: 2000 Volvo V70 XC--Check Engine Light!!

Postby jblackburn » 23 May 2010, 16:30

This is for a '98; yours might be slightly different.
Image

Check around with a can of carb cleaner with the engine running, spray up and down the lines. If you hear the motor rev up, you've found a leak.

No, you won't kill the O2 sensors, unless your car is running overly rich. Really, all your rear one does is monitor the efficiency of the converter. A bad front O2 sensor (which you don't have a code for) could both make your car run terribly, and the rich mixture COULD destroy the converter.

Replacing O2 sensors is not a hard task - the hardest part is undoing the connectors on them.
'98 S70 T5 218K miles
2012 Chevy Cruze LT 6MT


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Re: 2000 Volvo V70 XC--Check Engine Light!!

Postby adk793 » 23 May 2010, 16:46

ok, hearing that its most likely the O2 sensor is a big relief. Seeing the diagram, which specific hoses/connections am i looking for?

Also, is it just me or does something always have to go wrong with volvo. This is the second 70 series i drive and i havent been able to go 2-3 whole months without doing some kind of non-preventative maintenance repair. I love the car but just feel theyre not as reliable as some other cars out there.
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Re: 2000 Volvo V70 XC--Check Engine Light!!

Postby ecbsykes » 23 May 2010, 18:10

Depends on what you mean by reliable. :mrgreen: My 2000 V70XC has never left me or anyone who has driven it stranded, but I agree, a lot of stuff does go wrong. The nice thing though is that it's not usually that expensive to fix if you do the work yourself!

As I'm learning more about cars and Volvos specifically, I actually don't mind having a car that wants to break every couple months or so. I always look forward to my next repair job I get to do, because of the pure excitement I get when I'm done and it fires to life. :D

But I know some people don't have the time or means to do major repairs on their own time. Unfortunately, that's when costs really start piling up...
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Re: 2000 Volvo V70 XC--Check Engine Light!

Postby matthew1 » 23 May 2010, 19:02

Probably a small vacuum leak caused by a popped-off hose somewhere. Here's my recent experience with a PO422 code.
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Re: 2000 Volvo V70 XC--Check Engine Light!!

Postby matthew1 » 23 May 2010, 19:04

adk793 wrote:I love the car but just feel theyre not as reliable as some other cars out there.

That's because it's not :-). But it makes up for it with safety, fun, character and comfort. That's why we drive them.
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Re: 2000 Volvo V70 XC--Check Engine Light!

Postby jblackburn » 23 May 2010, 19:27

They do what they were built for pretty well - to get up and run every morning no matter what else is wrong with it. In that aspect, it's never let me down, though some of the EXPENSIVE repairs on other things have definitely got on my nerves.

I guess you could say I tend to drive my cars til the wheels fall off. Looking back, I've put 22,000 miles on mine in a year and a month. Just last April, I had hit 150,000 miles. And it still runs just as good as it did when I bought it.

And with all that, it pretty much sat/was driven by my dad back and forth to work for ~2 months.

While I admit it was nice to have my mom's Honda for those 2 months earlier this year, and not have to do anything but put gas in it (and very little gas at that, compared to my car), it just wasn't as exciting having a car that just...works, and I almost crashed/slid into things in the snow a few times because its traction is downright TERRIBLE in slick conditions where the Volvo shines.
'98 S70 T5 218K miles
2012 Chevy Cruze LT 6MT


A learning experience is one of those things that says, "You know that thing you just did? Don't do that."

mercuic: Long live the tractor motor!
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Re: 2000 Volvo V70 XC--Check Engine Light!

Postby adk793 » 23 May 2010, 20:18

I must say i agree, after my first volvo totaled, my option was to get my moms '03 camry. But i still decided to spend the money and buy a volvo, and at the most part i dont regret it. I must say its a durable car but also very fragile, all the probs come when you start havin some fun with it.

Anyways to get back on the issue of the Check engine P0422 code, what exactly do i do to find the problem. How would i know if it was the O2 sensors or the Cat Conv. Should i take it to my mechanic (volvo only specialist) and see what he thinks--hes an honest guy except he often says this code could mean a lot of things, id need to check it out in detail (then charge me $90 for that). So keep driving wouldnt hurt?
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Re: 2000 Volvo V70 XC--Check Engine Light!

Postby jblackburn » 23 May 2010, 20:25

Like several said, clear the codes for now and see if they come back. If they come back say, 2 more times or so, then worry more about diagnosing it.

My first matter of troubleshooting would be to hook up a scanner to the OBDII and read the values from the rear O2 sensor at several different engine speeds. You should see the values swinging back and forth - if you get to this step, I can look up a table of values for you; if it seems a bit slow about it or the values are out of range, it would explain the code for the O2 sensor.

Catalytic converters are less of a common failure item, but it does happen every now and then. About the best way to test this is to kick, smack, and shake the bottom of the catalytic converter and listen for something loose inside.
'98 S70 T5 218K miles
2012 Chevy Cruze LT 6MT


A learning experience is one of those things that says, "You know that thing you just did? Don't do that."

mercuic: Long live the tractor motor!
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Re: 2000 Volvo V70 XC--Check Engine Light!!

Postby JRL » 23 May 2010, 20:27

adk793 wrote:

Now if it is the Cat converter, would it damage like the O2 sensors if i let the problem be...and likewise, would bad O2 sensors do something bad to the Cat conv.

Ive done some maintenence/repairs on the car. Is this something i can do myself if i would have to change something?



Absolutely.
If one of these parts is bad, it CAN and WILL damage the other(s) if not taken care of fairly soon, besides you will see performance go way down as will your fuel mileage too!

You can do it yourself.
However, it's a bit hard to get to the bolts and replace a DP (CAT) on the ground, a lift is preferred.
You can buy a used converter from Erie and save bucks, never install used 02 sensors
( http://www.erievovo.com )
2000 V70R Black, 121,000 miles (Wife's).
2006 XC70 White only 59,000 miles. New daily driver.
2000 V70R Silver, 36,200 miles!!! SOLD (I will regret this)!

Contact info for purchases: jrl1194 (at) aol (dot) com
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