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  #1  
Old 06-01-2007, 08:36 PM
 
Join Date: Oct 2005
Posts: 16
Default A Check Engine light that won't go away!

I am having the worst month with dealing with my 2001 Volvo S40.

The Check Engine light came on after the car started hesitating when trying to accelerate. I take it to my mechanic, and it turns out I get codes to replace the oxygen sensors, catalytic converter and mass air flow.

Almost 2K later, I get another code for a map sensor. Get that changed, and now it reads that there are no codes and everything looks clear. No more check engine light. Well, I bring the car home, and the check engine light comes back home when I restart the car later. Go back, they clear the light, and (once again), it comes back when I start the car.

I have 115K on the car. I really don't know if I should stop putting money into this. I am due for inspection, so I don't know what to do!! Help!!!
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  #2  
Old 06-01-2007, 10:08 PM
 
Join Date: Jun 2006
Posts: 11
Default RE: A Check Engine light that won't go away!

I feel your pain. I wish you had posted before you sunk 2k. I had the same exact problem and all I did was change the spark plugs (use only Volvo or NGK-Iridium- for some resone these Volvos do not like any other kind). You can check my question earlier. I also had a P0128- t-stat coolant temp too low, etc. I changed the t-stat (thank god I did not have to change the sensor) and all my codes went away. Also make sure you use only premium gas (again there are many things that can throw the O2 sensor-catalitic convertor-mass air flow, etc, namely bad fuel, bad spark plugs, bad coils, and the O2 sensor itself (bet it was the front one).
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  #3  
Old 06-01-2007, 11:27 PM
 
Join Date: Oct 2005
Posts: 16
Default RE: A Check Engine light that won't go away!

Thanks for the reply.

I think I'm going to try the spark plugroute. I changed them two years ago, but maybe that's all it needs.

I learned the hard way last time about using Volvo brand spark plugs. Last time, I used non volvo spark plugs, and had to get raped, I mean, serviced at the dealership.

I will give an update next week after I order the spark plugs.
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  #4  
Old 06-06-2007, 09:42 PM
 
Join Date: Oct 2005
Posts: 16
Default RE: A Check Engine light that won't go away!

Good thing I changed the spark plugs. I was having major problems when I tried accelerating. Changing the spark plugs really helped the problem. The check engine light is still on, though. Do you have to clear the code for spark plugs? I might try to run to AutoZone this weekend.
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  #5  
Old 06-08-2007, 04:52 PM
 
Join Date: Oct 2005
Posts: 16
Default RE: A Check Engine light that won't go away!

Well, just got back from AutoZone, and everything I just replaced (O2 sensor, map sensor, mass air flow) are still coming back up as codes. I've already had the codes cleared, drive home and the check engine light keeps coming up. They changed the mass air flow already. I think the O2 is a "new" code. All of these parts are under warranty, I just don't understand why the cleared codes just can't stay cleared [:@]

I'm sure my mechanic is sick of seeing me. I don't know what else to do! Anyone have any other recommendations?
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  #6  
Old 06-08-2007, 08:01 PM
 
Join Date: Oct 2005
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Posts: 67
Default RE: A Check Engine light that won't go away!

One night when I was driving home in my Volvo the check engine light starts flashing, and the idle changes. I run the codes the next day at Autozone, with it coming up with mulitiple codes. I was about to change my Volvo oxygen sensor and the cats, then the mechanic told me to replace first my spark plugs and see if it will fix my problem... The next day I started the car and all the codes went away... I don't really know what happens but I'm glad it happened because because it saved me some bucks... Try also to check all the fuses in the underhood fuse box. My mechanic also to me that sometimes wiring problems cause multiple codes. Good luck!!!
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  #7  
Old 06-09-2007, 10:28 AM
 
Join Date: Oct 2005
Posts: 16
Default RE: A Check Engine light that won't go away!

Just got back from the mechanic. There are no vacuum leaks...I've changed the spark plugs, the car runs fine, but for the 4th time, they clear the codes, the check engine light goes off. Except when I turn the car off and then back on, the check engine light comes back on. I really don't want to go to the dealer. Could this be a computer problem? I got the computer upgrade a couple of years ago.
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  #8  
Old 06-09-2007, 10:40 AM
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Default RE: A Check Engine light that won't go away!

Still getting the map sensor code?

You know there is 2 Map sensor right?
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  #9  
Old 06-09-2007, 02:39 PM
 
Join Date: Oct 2005
Posts: 16
Default RE: A Check Engine light that won't go away!

Hi Tech,

No, I did not know there were two. The one he changed was visible next to the engine. Where is the other one
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  #10  
Old 06-09-2007, 03:11 PM
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Default RE: A Check Engine light that won't go away!

The other one should me mounted in the top of the intake manifold.
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Old 06-09-2007, 03:11 PM
 
 
 
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air, away, car, changed, changing, check, computer, engine, flow, light, map, mass, oxygen, plugs, s40, sensor, spark, volvo, wont


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