Wednesday, February 18, 2009

Subaru Tech Post! P0457 CEL Problem & Fix

The P0457 CEL (check engine light) isn't actually documented in my 2002 Subaru WRX factory repair manual. Luckily, Google does list it ;)
The problem is "Evaporative Emissions Control System - [Gross] Leak Detected"
...Sounds bad.

The good news is that it's likely one of two things.
1. Your gas cap isn't on tight enough
-Or if you're like me and just installed a new turbo inlet host (Perrin!) it's probably
2. The EVAP purge hose.

Here is what I'm talking about. Look at the blue nozzle that isn't connected to anything. It's down under the intake manifold to the left of the alternator.


The little hose down and to the right of the blue nozzle is supposed to be connected. I must have yanked it off while changing the intake.

The picture below is what it's supposed to look like when the hose is hooked up properly. If you snapped the connector (I didn't) you'll need to buy a new part.


Cheers!

16 comments:

apexwagon said...

ur awesome! thank you so much, i am about to go check that!! thank you google!!!

Anonymous said...

Classs mate, was exactly what was wrong with my sti, cheers again

ken said...

Hey, I had the same code as you. And I looked at the blue nozzle. There's two hoses that connect the blue thing, but is there supposed to be a third hose? Cause I don't see a third hose which is probably my problem. Thanks.

David said...

Had same problem: check engine light with code P0457 (shown on Cobb tuning Access Port). Just had recall fixed for fuel leak under intake manifold, so I looked at the vacuum connections and it was one of the other vacuum lines near the blue nipple; the tubing had become old and no longer sealed. Replaced a 1.5" piece of vacuum tubing and used the access port to reset the ECU. So far, no recurrence.

Anonymous said...

hey quick question...

is this only for the wrx or all imprezas? i have a 2005 2.5rs and im having the same problems...

Andrew said...

I'm not sure if it's all Imprezzas or only turbo models. It's easy enough to see if you've got it though as it's at the front left of the intake manifold when you open the engine.

Anonymous said...

This has been the answer to my prayers for the past 3 Months. Thank GOD no more CEL!!!!!!

Anonymous said...

This has been the answer to my prayers for the past 3 Months. Thank GOD no more CEL!!!!!!

Anonymous said...

I had the same issue. Connected the blue nipple and everything worked fine. Thanks for the help

Dave said...

I got the same code and I checked the valve and mine was connected.. I then even for better measures added zipties to the hoses to tighten them down and no good. still have the code coming back on after I clear it..

Anyone else??

02 wrx

SpooledupRacing@comcast.net

Anonymous said...

Thank you so much for this post. I've been dealing with this for 2 months thinking it was my gas cap! Low and behold the hose was not connected to the blue nipple.

Anonymous said...

awesome...thanks for the tip!!! That was my problems also!

Anonymous said...

I own a 2002 Subaru Wrx that I recently purchased a month ago. As soon as I was driving back home after buying it, the p0457 code came on. I had the dealership touble shoot it twice. They even did a smoke leak test. I went online to try and find the cause of the problem myself. I came to this helpful page. Inspection of my EVAP purge solenoid revealed one hose connection and the other one was cut in half. One half was sealed with a screw and the other with a small little cap. Going to get it fixed next Monday. Thanks A lot!!!!

Derek said...

I also had the fuel rail recall done a week or so ago. The car sounded a bit different but after being reassured by the subaru techs it was normal I let it go until I got the CEL. I just went out to check to see if the hose was off and sure enough, it was! I can't wait to get home to plug it back it and see if it fixes me issue! :D

Derek said...

I also had the fuel rail recall done a week or so ago. The car sounded a bit different but after being reassured by the subaru techs it was normal I let it go until I got the CEL. I just went out to check to see if the hose was off and sure enough, it was! I can't wait to get home to plug it back it and see if it fixes me issue! :D

Anonymous said...

Had this code today after car being on jack stands for months I must have forgotten to put this back together after turbo and injector install. This page made it clear as day what MAY be my problem and sure enough, hose had been knocked off by my gorilla finesse. Thank you!