check engine

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Old 13 Aug 2006, 12:27 pm   #1 (permalink)
stevie
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Default check engine

Check engine light has turned on.

Mechanic I trust said code indicates the catalytic converter is bad (code is
P0420).
He said that code is pretty straightforward as far
as trouble goes. He turned light off, but it came back on about a week
later.

Is there anything short of a bad converter that would turn the check engine
light. Car has 170000 miles, purchased new.


1996 Camry, 4 cyl
AC, PB, PS
Auto trans



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Old 13 Aug 2006, 04:00 pm   #2 (permalink)
johngdole@hotmail.com
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Default Re: check engine

Bad batches of oxygen sensors can do this. Later years had a TSB.
Sensors and converter changed free within warranty. But 96 in any case
is probably out of luck (might want to check with the dealer).

It may be the converter, or it may be your oxygen sensors. If the cat
passes smog test as in a case I came across I'd just change the sensors
be done with it. If so replace the Denso thimble sensors with Bosch
planar sensors. I'd avoid Denso sensors like a plague (but they do make
excellent alternators). Bosch planars have vent holes only at the tip
and IMO are best-in-class.

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

You also have to make sure your car is properly tuned up. Timing belt,
plugs, the works.


stevie wrote:
> Check engine light has turned on.
>
> Mechanic I trust said code indicates the catalytic converter is bad (code is
> P0420).
> He said that code is pretty straightforward as far
> as trouble goes. He turned light off, but it came back on about a week
> later.
>
> Is there anything short of a bad converter that would turn the check engine
> light. Car has 170000 miles, purchased new.
>
>
> 1996 Camry, 4 cyl
> AC, PB, PS
> Auto trans


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Old 14 Aug 2006, 08:58 am   #3 (permalink)
Daniel
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Default Re: check engine

johngdole@hotmail.com wrote:
>

Bosch planars have vent holes only at the tip
> and IMO are best-in-class.

===========================
Bosch introduced those in 1997 seemingly with different voltage
characteristics.

Be sure they're compatible with the 1996 engine management system.

Not sure about the 1996, but my 1994 is unheated whereas the planar are
heated.

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Old 15 Aug 2006, 01:17 am   #4 (permalink)
johngdole@hotmail.com
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Default Re: check engine

You're right Daniel. Parts catalogs suggest 96 uses unheated, 2-wire
sensors. But if planars are an option, I'd always use them in place of
thimble sensors.


Daniel wrote:
> Bosch introduced those in 1997 seemingly with different voltage
> characteristics.
>
> Be sure they're compatible with the 1996 engine management system.
>
> Not sure about the 1996, but my 1994 is unheated whereas the planar are
> heated.


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