Question about 2003 Chevrolet S-10

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Had a dead battery. codes won't reset

Won't pass inspection no check engine light, but brings up evap and catalyst codes

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Some cars and trucks after 1995 have to be hooked to a scanner to reset codes. before 1995 you could unhook neg. battery cable and do that. take to autozone they will erase them codes for you.

Posted on Jan 23, 2009

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My 2001 x5 evap & catalyst report not ready, I reset my MAF OBDII Code ~70 miles before checking it, but...


if you had reset the code[ or had a dead battery]you just cleared and reset all the vehicles evap / emissions systems it now has to recycle through to reset you wont have a check engine or mil unless computer finds a fault and on most vehicles it can be about 125 miles and usually the last to reset are the evap and the catalytic converter drive around and at around 125 mark go to an auto store and have vehicle scanned most offer this service for free or if you have one check your system for ready if not keep driving some more most states give you 10 days to retry so use that time to rack up miles -- and dont reset or clear codes before an inspection

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Evap system and catalyst not passing for inspection


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Tried getting ford f150 4.2 2003 inspected. Replaced air filter and fuel filter already. Check engine lit was on before replacing them . Now check engine light is out . But won't pass inspection.


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Last week I had the very same catalyst, evap and ECG codes come up on my 1999 Mercury Mystique which is like a Ford Taurus. A friend was able to find a hole or leak in the hose connected, replaced it and it runs fine. I havent run it a full and straight 50 miles yet to clear the check engine light but that repair alone changed the entire way the car was poorly driving. Im sure that hasnt fixed all the probs but thats a good starting point.

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PO402--EGR Flow Excessive Detected

There are other components besides the
egr valve in that sytem,so you got things to
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PO443---Evap Control System Canister Purge

Valve Circuit Malfunction


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I can't get an inspection sticker for my car because it keeps failing inspection because the computer will not reset. Every time it does the same thing. When they test the OBDII Readiness it says the...


Every time you reset the light or disconnect the battery it completely resets the system and it has to go through EVERY test again. The O2, EVAP, and Cat tests are generally the LAST THREE tests that are tested. You're not doing yourself any favors here.

Essentially what these readiness monitors are is the computer's notation that his has run the self diagnostics on each system and that the results feel into the expected results. If it is outside the expected results the computer will generally try to run the test multiple times before setting a DTC and turning on the Check Engine Light. It cannot set the status to "Ready" until it has a successful test within expected results; sometimes multiple successful tests. Sometimes, the tests need to run at different speeds - so the vehicle has to be driven not only at freeway speeds, but also city speeds for the tests to complete properly.

The O2 test MUST complete before the Catalyst test can run. The EVAP test generally requires that you have your fuel level at between 1/4 and 3/4 and that the vehicle sit undisturbed after being driven for a period of time for no less than 8 hours in order to run the EVAP test.

The same can be said for the O2 test sometimes because the computer needs to test the O2 sensors reaction to heating up and cooling down. Eventually they will all complete - unless there is an issue. I have seen where a component was in the process of going out and the computer was getting both GOOD and BAD results when running the tests. As a result it wouldn't set ready status because it wasn't getting the concurrent GOOD test results.

As a Texas Recognized Emissions Repair Facility - my shop sees this kind of stuff all the time.

Good Luck.

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I need to get it inspected and everytime i go they say the computer isnt reset from where the engine light was on and i unhookeed the battery. also when i push the gas petal to accelerate from a stop. it...


A vacuum leak will do all that for you, aamco trans will check that light on code in the computer for free.You would be smart to find someone to check your computer for all codes because it will tell you without wasting money on bad advise.

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I have a problem with my 2001 Toyota sienna, took it to inspection yesterday to get inspected and didn't pass results Cat not ready and evap not ready, inspector tell us run the car couple miles and bring...


If the "evap not ready" readiness monitor never clears and you keep getting P0440,P0441,P0446 type codes, then you have a problem with the evap system. You have already tried the gas cap (good start) but there are about 6 other things it can be from electrical VSV air valves (there are 3 of them, 2 under the hood, 1 near the charcoal cannister (behind fuel tank) to 2 air operated valves on the front of the same cannister. There is also an air line that goes to one of the electric VSV valves on the air cleaner under the hood. Several oil change places have been guilty of pullling these off and not reconnecting them.
We have a page with pictures of our experience,

http://www.findonefindall.com/toyota-sienna/toyota_sienna_evap_P0446.htm

Apr 21, 2009 | 2001 Toyota Sienna

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