Intermittent P0451 CEL
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Super Member
Joined: Apr 2010
Posts: 754
Likes: 10
From: Houston, TX
a car.
Intermittent P0451 CEL
I've researched the code and it's in response to EVAPORATIVE EMISSION CONTROL SYSTEM PRESSURE SENSOR RANGE/PERFORMANCE. Is there anyone with experience in this matter? What should I be looking for?
I cleared the code and the CEL went away for a while, now it's back. Sometimes the CEL comes on when I start the car and other times it doesn't.
I was messing with my airboxes at the dyno day this weekend, could that little tube from the splitter have come loose and cause this? Any information is appreciated.
I cleared the code and the CEL went away for a while, now it's back. Sometimes the CEL comes on when I start the car and other times it doesn't.
I was messing with my airboxes at the dyno day this weekend, could that little tube from the splitter have come loose and cause this? Any information is appreciated.
Senior Member
Joined: Jun 2008
Posts: 300
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From: ATL
05 C55 AMG
I googled it and it gave me this link which might help
http://www.permoveo.ltd.uk/tabid/122...z/Default.aspx
What does this mean?
OBD Code P0451refers to
The EVAP control system pressure sensor detects pressure in the purge line. The sensor output voltage to the ECM increases as pressure increases. The EVAP control system pressure sensor is not used to control the engine system. It is used only for on board diagnosis.
Symptoms
Possible sumptoms of OBD code P0451
- Engine Light ON (or Service Engine Soon Warning Light)
Causes
Possible causes of OBD code P0451
- The EVAP control system pressure sensor circuit is open or shorted - Rubber hose to EVAP control system pressure is clogged, vent, kinked, disconnected or improper connection. - EVAP control system pressure sensor may be faulty - EVAP The Error code is generally activated on detection of the following conditions: - An improper voltage signal from EVAP control system pressure sensor is sent to ECM.
OBD Code P0451refers to
The EVAP control system pressure sensor detects pressure in the purge line. The sensor output voltage to the ECM increases as pressure increases. The EVAP control system pressure sensor is not used to control the engine system. It is used only for on board diagnosis.
Symptoms
Possible sumptoms of OBD code P0451
- Engine Light ON (or Service Engine Soon Warning Light)
Causes
Possible causes of OBD code P0451
- The EVAP control system pressure sensor circuit is open or shorted - Rubber hose to EVAP control system pressure is clogged, vent, kinked, disconnected or improper connection. - EVAP control system pressure sensor may be faulty - EVAP The Error code is generally activated on detection of the following conditions: - An improper voltage signal from EVAP control system pressure sensor is sent to ECM.
Last edited by thegreatfnr; Aug 2, 2011 at 09:19 AM.
Senior Member
Joined: May 2008
Posts: 340
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From: Indiana
Silver 02 C32 & White 05 CLK500
Sorry to dig up an old thread, but I am having this same exact problem. I have the P0451 and P0302(Cylinder 2 misfire). I had taken out and re-gapped the plugs, and still the misfire code. I am getting some new ignition wires(I still have the originals on), so hopefully that takes care of the misfire. However, I am worried about the P0451. Something weird has been happening where the gas needle would just drop to the bottom even though there is gas in the tank. I thought it was something to do with the fuel filter, so I replaced it and over time it got worse. I would have to disconnect the battery so the needle goes back to its normal position. Now, when the car is in drive and in first gear when I just let off the gas and let the car go forward on its own, it is very jerky and it shivers from underneath. It is slow and unresponsive. I dont know if the fuel pump is dying, or I got a fuel filter with a bad pressure regulator, or maybe a faulty fuel sender unit, or some sensor? Any opinions are appreciated.
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Joined: Jul 2007
Posts: 1,013
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From: Livingston, California.
2002 c32 AMG 2012 c250 Coupe
Same code here.. Cleaned out my code3 and k&n air filters last weekend and code came on yesterday.. I also thought it might have been the little hose that connects to the air box on the driver side.. I just cleared it and hopefully it doesn't come back..
Super Member
Joined: Aug 2006
Posts: 510
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From: san jose, ca
2002 C32 1987 190E 2.3 334K miles and going
Is not connected to anything
