('01-'02) Check Engine Light (CEL) = 8 Codes <-- Help - Subaru Forester Owners Forum
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post #1 of 14 (permalink) Old 09-13-2011, 08:09 PM Thread Starter
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Check Engine Light (CEL) = 8 Codes <-- Help

So I got my check engine light checked, and it came up with 8 codes. 6 different codes, 2 popped up twice. What do they mean? How can I remedy them?

P0335
P1443 (Triggered 2 of these)
P0171
P0420
P0136 (Triggered 2 of these)
P0037

I know at least 1 of these deals with my catalytic converter. I knocked out the rear catalytic converter.

Is there a list anywhere here that shows what each code means?

Feel free to post pics of any specific parts or mods or places to check for the problems.

Thanks in advance!

Last edited by CinderBlock; 09-13-2011 at 09:18 PM.
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post #2 of 14 (permalink) Old 09-13-2011, 08:23 PM
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P0335 is crankshaft position sensor...

P1443 is some kinda EVAPorative emmisons vent failure.

P0171 system too lean (too much air, vs fuel) could stem from a vac leak at idle

P0420 is the famous cat below threshold code... 2nd 02 sensor is reading HIGH emmisions.

P0136 Rear Oxygen Sensor Circuit Malfunction ...


P0037 is REAR O2 SENSOR HEATER CONTROL CIRCUIT LOW


Jesus tap dancing christmas, thats a helluva list of codes you got there buddy.

Sounds like your rear 02 sensor is SHOT for one, and perhaps some vac leak is causing a lean burn and an evap issue.

When did all of these occur?

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post #3 of 14 (permalink) Old 09-13-2011, 08:33 PM Thread Starter
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I knocked my cat out about 2 years ago after I found out that it failed. May not have been my smartest move ever. And definitely before I got involved on this forum. So the check engine light has been on for about 2 years. Nor was it very smart to let my CEL go for 2 years without checking. Figured it was 'just the catalytic converter'. And then recently, I had problems with my car starting after refueling. A couple weeks ago. (See Problems starting engine after refueling)

Got my codes checked today.

So now I need to know how to make em disappear.
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post #4 of 14 (permalink) Old 09-13-2011, 08:56 PM
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If it's been that long since it's been on, I'd clear all codes and drive for 100 miles or so. Then check them again. See what comes back. You also need to look for a vacuum somewhere.

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post #5 of 14 (permalink) Old 09-13-2011, 09:17 PM Thread Starter
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You also need to look for a vacuum somewhere.
You mean vacuum leak? Or some other component?

Feel free to post pics of anything I need to do.
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post #6 of 14 (permalink) Old 09-13-2011, 09:57 PM
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Check to see if anythings looks out of place under the hood, especially in the intake manifold area(s) , check to see if any hoses got popped off.

I would look into replacing your crank angle sensor, seeing as you have a check light for one.


Also this lean-burn check light could stem from a clogged fuel system, which would certainly cause the car to run funny, and have trouble starting. Try changing out your fuel filter and see where that gets you. For all we know, it could be clogged.


As for the EVAP code, the evap canister may be clogged or malfunctioning (on its own) apart from these other codes, so it may not be related.

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post #7 of 14 (permalink) Old 09-14-2011, 05:48 AM
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P1443 points to the valve on the canister at the rear of the car under the bumper (on passenger side). It could also be a loose gas cap, or even a rusted out fuel filler tube. It's most likely the valve if you're having actual issues after refueling, could be the wiring, valve, or even the hoses going to it being blocked.

Your rear O2 sensor is most likely bad, or the wiring is bad. Without a cat it should only give a p0420.

P0171 could be either the sensor itself or some sort of leak, could even be a dirty MAF sensor if your car has one.

The CPS code probably means the sensor needs to be replaced, but I'd pull it out and make sure its not just all gunked up.

04xt/4eat, 16g, STI bits and bobs
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post #8 of 14 (permalink) Old 09-15-2011, 07:33 PM Thread Starter
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I got my CEL codes cleared out. I'll have to wait and see how long that lasts. Also picked up a new fuel filter. Let's see if that helps any.
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post #9 of 14 (permalink) Old 09-15-2011, 07:40 PM
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There's a list of CEL codes here.

2003 XS Premium MT >200k miles! ● 2005 Impreza 2.5 RS MT ● Robin-Subaru Powered Generator
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post #10 of 14 (permalink) Old 09-15-2011, 10:55 PM
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You should check the fuel filler tube. It is under a plastic cover, you have to take the wheel off to really get to it. I was getting an EVAP emissions code and it turned out the filler tube was rusted and the sensor on the tube was destroyed (rollover sensor I think). Common problem with 01's sadly.
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post #11 of 14 (permalink) Old 09-16-2011, 08:24 AM Thread Starter
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Quote:
Originally Posted by WNC Forester View Post
the filler tube was rusted.
Oh gosh. I hope not. I'll check today.
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post #12 of 14 (permalink) Old 09-16-2011, 12:49 PM Thread Starter
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Fuel filler tube looked like it's brand new. But I sheared off a bolt trying to get 1 off.
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post #13 of 14 (permalink) Old 09-18-2011, 08:58 PM Thread Starter
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CEL on again for the P0136. So O2 is toasted for sure. Now to wait and see if any others pop in...
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post #14 of 14 (permalink) Old 09-29-2011, 08:06 PM Thread Starter
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Got the CEL checked after a few hundred miles of driving. The O2 sensor popped up again. Also the EVAP solenoid failure. If it is the EVAP solenoid itself, where in the world is it located?
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