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CEL P0108

 
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Old 10-08-2008, 08:23 PM
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CEL P0108

Comes up as "The PCM has determined that the manifold absolute pressure sensor or the barometric pressure sensor input is higher than expected for the current engine operating conditions"

I've had a MAP sensor CEL before, but I just cleaned it out and it worked fine/CEL went away.

It all started like this, Me and some friends sprayed down the engine bay with some degreaser. Drove our cars for awhile, then out of nowhere they start acting all stupid. It would idle real rough, almost die when pressing the gas for both of ours (mine is standard his is auto...also his is a civic) They sounded like a lawnmower/muscle car being severly robbed of horsepower. So...we let our cars sit for awhile, I left and it was still doing it. A little while later mine stopped and so did his. I parked my car for the night and the next day it started doing it again, but his was fine. I was getting a misfire from one of the plugs. I went and bought new plugs which stopped the sound and sluggishness, but the CEL came on before I changed the plugs. So what to do?

EDIT: I do have a CAI, but thats been on the car for a very long time.

Update!
After I pulled the battery cable the CEL came on again last night. I took it to go get a reading and this time it came up as P0420 ... Catalytic converter
I might be wrong but isn't the catalytic converter the "cat" on a cat back exhaust?
If so can I order just any cat to go on my exhaust or would I be looking at an entire new exhaust system? I have the GReddy Power Extreme cat back exhaust.

Last edited by BlazeYDH; 10-12-2008 at 06:28 PM.
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Old 10-09-2008, 01:24 AM
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Re: CEL P0108

Maybe your MAP sensor got muffed up from the degreaser?
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Old 10-09-2008, 01:53 AM
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Re: CEL P0108

Did you rest the ECU after you changed the wires?
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Old 10-09-2008, 03:14 AM
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Re: CEL P0108

No I don't know how to reset the ECU and I tried cleaning out the MAP sensor to no avail, but today the positive battery cable was loose and so the car had no power when I went to start it. I reconnected the battery cable and the CEL went away and hasn't come back...yet...
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Old 10-09-2008, 03:23 AM
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Re: CEL P0108

To fully reset an OBD II Ecu, you need the scan tool that mechanics have so they can reset and clear the codes. Go to Autozone and they'll do it for you. After that, drive about 60-100 miles to get the emissions components; O2, Catalytic converter, EGR etc. to be "ready." Then, see if this code returns.


This link should help you a little: http://www.obd-codes.com/forums/sear...&submit=Search
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Old 10-09-2008, 02:24 PM
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Re: CEL P0108

if your map sensor is on your throttle body: how is the gasket(if there is one)? if the gasket is f'ed and it leaks then it will run like ****. there is quite the suction through the hole that the map sensor goes over.

if your map isnt on your TB: my post is worthless.
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Old 10-09-2008, 02:41 PM
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Re: CEL P0108

Quote:
Originally Posted by BlazeYDH View Post
No I don't know how to reset the ECU and I tried cleaning out the MAP sensor to no avail, but today the positive battery cable was loose and so the car had no power when I went to start it. I reconnected the battery cable and the CEL went away and hasn't come back...yet...
That's one was to reset it it don't always work and might have to do what Prelude13 said to do. Just drive it and see if it comes back on or not.
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Old 10-13-2008, 01:46 AM
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Re: CEL P0108

Update.... Look at the top.
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Old 10-13-2008, 02:34 AM
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Re: CEL P0108

hmmm 420 you say haha

QUOTE=Prelude13;124811]^nice.



A code P0420 may mean that one or more of the following has happened:

* Leaded fuel was used where unleaded was called for
* An oxygen sensor is not reading (functioning) properly
* The engine coolant temperature sensor is not working properly
* Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe
* Retarded spark timing
* The oxygen sensors in front and behind the converter are reporting too similar of readings


taken from: obd-codes.com[/QUOTE]

What i did is ran a 2 things of gas treatment in a full tank, took out both 02s and sprayed them with electrical counter cleaner(idk if this is a good idea or not just what i did) and throw in a thing or engine restore. I did all that and never got the code again cost me under $15 so might want to try that b/4 u buy a cat.
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Last edited by yogi_pahl; 10-13-2008 at 02:39 AM.
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Old 10-13-2008, 04:01 AM
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Re: CEL P0108

Great, thanks! Can I get a pic of where the two O2 sensors are? I'll try this tomorrow if I can.
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Old 10-13-2008, 04:26 AM
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Re: CEL P0108

I think there is one right after the header and then right after the cat. Ez to spot just look on the exhaust and find the tings with wires hooked to them.
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