All kinds of emission codes- help

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Old 26 Sep 2006, 08:25 am   #1 (permalink)
tboner
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Default All kinds of emission codes- help

My son brought our camry home from college and I am getting all kinds
of emission codes.
It all started with a catalyst below threshold bank 1 (420) which was
intermittent last winter.
Now I am getting a 440, 441, 460, etc....a whole batch of emission
system codes.

Does this sound like a hose or some such that has come loose in the
emission system or is there
a plug somewhere? I am not a mechanic but I have managed to do things
in the past - any suggestions
on how I can start trouble shooting this thing. I turned the codes off
last evening to see which ones would come back and how quickly.......

I have to say that it his been ages I am sure since he had it tuned up
(if he ever did). I will surely start there.......just need to know
where to look and where to go next........

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Old 28 Sep 2006, 12:28 am   #2 (permalink)
johngdole@hotmail.com
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Default Re: All kinds of emission codes- help

You didn't say what year was the car. The P0420 code can be a lot of
things, the last of which is the cat. If you don't have any false air
leak in the exhaust pipe between the engine and the sensors, then it's
most likely the primary/secondary sensors have gone bad, especially if
you are getting good numbers from a smog test.

If you isolated it to and if there is a need to replace oxygen sensors
(which are impossible to test outside a lab environment, relying on
codes for anything other than the heaters is not reliable here), I'd
recommend only Bosch Planar oxygen sensors. You can save a few dollars
by using the specified "universal" sensor for your year/model, but
you'll have to splice the old connector to the new sensor. That's an
additional 30 minutes instead of plug and play. But I've gone this
route just to get a Bosch planar for a secondary sensor. I'd stay away
from Denso thimble sensors, which can be part of the problem.

http://www.boschautoparts.com/Produc...nsors/PlanarO2

As far as evaporative system codes go, start by checking: gasket on the
gas cap. Is it in good condition? Is it missing? Is it the correct cap?
Check the purge control vacuum switching valve (VSV) mounted on the air
filter housing if so equipped. There is a hose coming from the carbon
canister and then to the throttle body on either side of this VSV.

If you remove the hose at the VSV from the canister while the engine is
running, you should hear repeated strong vacuum sounds as the VSV is
turn on/off. (Note: canister hoses contain fuel vapors. Take all
necessary precautions). If the vacuum isn't strong (that is, above
15psi) or it doesn't shut off (doesn't go to 0), then you may be able
to clean and lightly lube it by prying up the fingers that hold the
plastic cap. Seal it completely afterwards. But don't break anything or
it's $55-100 at the dealer. That VSV has the tendency to stick after a
while and can give you the evap codes because it upsets the pressure
balance in the system beyond spec.


tboner wrote:
> My son brought our camry home from college and I am getting all kinds
> of emission codes.
> It all started with a catalyst below threshold bank 1 (420) which was
> intermittent last winter.
> Now I am getting a 440, 441, 460, etc....a whole batch of emission
> system codes.
>
> Does this sound like a hose or some such that has come loose in the
> emission system or is there
> a plug somewhere? I am not a mechanic but I have managed to do things
> in the past - any suggestions
> on how I can start trouble shooting this thing. I turned the codes off
> last evening to see which ones would come back and how quickly.......
>
> I have to say that it his been ages I am sure since he had it tuned up
> (if he ever did). I will surely start there.......just need to know
> where to look and where to go next........


  Reply With Quote

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