oleg lego

2004 Elantra.

Had it in to the dealer several times for a "Check Engine Light". They
said it's a P0449 code.

History follows:

05/24/05 - Performed a Service Engine Scan. Found one history code
leading to Evap system. Cleared and tested. Customer to
monitor

05/27/05 - Failure Code P0449
Cause: Fuel tube hose was split allowing water into the purge
cannister and cannister filter
Correction: Replace hose and drain water from the cannister
filter

06/01/05 - Cause: Diagnostic Code P0449 Vent Valve circuit cannister
close valve innop.
Correction: Replaced valve

Since that time, the Check Engine Light has been on and off quite a
few times. The car is running fine, but I worry that the light being
on renders it useless, as it could mask other problems that might show
up. This whole thing started not too long after the car was rear-ended
and repaired.

Any ideas?

Thanks,
Larry (lar3ry at sasktel dot net)


Larry
---
There are 10 kinds of people --
those who understand binary, and those who don't.
-- Uncle Phil

hyundaitech

First, you should probably find out what code is present now. That'll tell
us whether we're still combatting the same issue or something different.

Presuming you have the P0449 again, the evap. system needs to be checked
for fuel intrusion. Liquid fuel in the evap system can cause vacuum to
not vent properly.

The fuel tank pressure sensor should be checked for proper operation.

The plumbing for the evap system should be checked for proper routing and
connection and condition(possibly collision related).

If you had water in the canister filter or canister itself, it's possible
one or both of these components was damaged, especially the charcoal
canister. Liquid in charcoal canister requires it to be replaced.

halatos2000

It seems rather stupid on the part of the dealer to scan and obtain a
code and take no diagnostic action other than to 'clear the code' and
send you on your way, which is precisely what they did on your first
visit.

And, to add to that, P0449 is a 'generic' obd-ii code that says the
failure is in the evap system vent solenoid. What did the dealer do on
trip number 2? They replaced a bad hose. They still(apparently) did not
check the electrical circuit or the physical function of the vent
solenoid.

On trip 3, they replaced the valve, something that should have been
inspected and tested on visit number 1.

If the engine light is on now, run the car down to
checker/autozone/kragen, etc. and have them pull all of the diagnostic
codes out for you(they will perform this service for free), and post
your findings here.

There are four types of OBD-II codes, if they begin with a P it is a
powertrain code. If the first digit is a zero, P0xxx then it is a
'generic' OBD-II code that is common to all OBD-II equipped vehicles.
If the first digit is a 1, P1xxx, then it is a manufactureri-specific
diagnostic code. You will need access to hyundai service literature to
know what a P1xxx code means. However, you can read all about the
'generic' codes here

http://www.obdii.com/codes.html

Let us know what you find out.

Chris