I am getting 3 codes: P0325, P0440 and P1448

Let me begin by saying that my check engine light has not come on. I believe this is the case because my "mechanic" somehow disable the light. Whether or not this is possible Im not sure but it seems probable considering I have 3 codes and no check engine light.

P0325: This is a knock sensor code. I had this exact same code about a year ago and I took the car to the mechanic. He replaced the knock sensor and I the check engine light hasn't come on since. However, even after the problem was "solved" I noticed that the car laggin on most days and my gas mileage remained at around 17 MPG. Now Im beginning to think that nothing was fixed in the first place.

P0440 and P1448. The P1448 is a manufacturer specific code for the charcoal canister vent valve stuck open. I don't know when these codes showed up because my light never came on. I do know that they were not present when I checked for the KS code a year ago. Is it possible that these codes are related to my BUDGET Y-PIPE? I just had it installed about a month ago. Has anyone else had similar problems.

Thanks in advance!

And BTW, I just failed inspection...Imagine my surprise!

 

P0440 is EGR. The tube from valve to intake is clogged with carbon.

P1448 is Vent Control Valve on the canister.

Of course P0325 is KS, which will not illuminate the CEL.

BTW, yes your CEL bulb must be disabled or burnt out. The first two codes will surely turn it on if it is present and working. Turn the ignition key to the run position without starting the engine. the CEL should be lit. If not, there's your first problem to fix.

 

It's possible he did replace the sensor, the knock sensor code can come up if you are running 87, experiencing knock for other reasons, or if there is an actual problem with the sensor (cracked, melted, etc.) or harness.

 

The check engine light comes on. Can EVAP problem be related to the Y-pipe?

 

No Y-pipe does not cause Evap problem. P1448 is Vent Control Valve on the canister needs to be checked.

 

Thanks


Bump.....


Hoping that someone who experienced these problems in the past can pinpoint me to the source of the issue.

 

I guess I don't fully understand.

First you say the light doesn't come on, now you say it does.

How do you know that you have any codes, did you hook a scanner to the car?

And, if you did that and do have the codes you first listed, then we have told you what to do to fix it.

 

before starting the car, when the key is on ACC and when all the christmas lighs go on, does the CEL light up as well ?

 

The light "works" but it doesn't come on even with these codes. I know it works b/c it lights up when I start the car. I know I have those codes because I failed inspection and they pulled them.

Is it possible for the EVAP codes to trigger the KC code? After all, I did replace the KS a few months back when the CEL came on.

 

Bump.....

Being that I replaced my KS is it likely that the EVAP codes are triggering the KS code? Is that even remotely possible? Or is it more probable that the KS harness or something to the like is malfunctioning. I really want to get ride of this KS ghost code!!!

Thanks

 

Anything is possible, but the KS code setting off the EVAP code, or vice versa is highly unlikely.

 

In that case, does a P0325 code point to anything besides the KS? Are there other factors in the equation? Like I said before its weird because I had a check engine light which pointed to a faulty KS. We put in a new KS and the light went away. Now there is no light yet the code is still there.

 

Re read posts #2 and 5.

 

& #3 as well.

 

P0440 is not EGR.
Diagnostic Trouble Code P0440 is a problem with the Evaporative Emission Control System.
That code could be a number of things:

- incorrect fuel tank vacuum relief valve
- incorrect fuel filler cap
- fuel filler cap vent remains open or fails to close
- foreign matter caught in fuel filler cap
- a leak in the line between the intake manifold and the
EVAP Canister Vacuum Control Valve
- foreign matter caught in the EVAP CVCV
- leaks in the EVAP canister or fuel tank
- leaks in the EVAP purge line (pipe and rubber tube)
- EVAP purge line rubber tube bent
- blocked or bent rubber tube to EVAP control system pressure sensor
- loose or disconnected rubber tube
- EVAP CVCV and circuit
- EVAP Canister Purge Volume Control Solenoid Valve and circuit
- absolute pressure sensor
- tank fuel temperature sensor
- MAP/BARO switch solenoid valve and circuit
- blocked or bent rubber tube to MAP/BARO switch solenoid valve
- O-ring of EVAP CVCV is missing or damaged
- water separator
- EVAP canister saturated with water
- EVAP control system pressure sensor
- refueling EVAP vapor cut valve
- ORVR system leaks

P1448 is Vent Control Valve on the canister though.
I would say the codes are related to the same problem.

Knock sensor code not related, as someone has stated before.

 

Oops, I misread that. Thought I saw P0400.