'97 CAMRY 4 CYL: OBDII code P0420

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Old 26 Feb 2009, 04:14 pm   #1 (permalink)
oparr
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Default '97 CAMRY 4 CYL: OBDII code P0420

My CEL was on for about a year due to this P0420 code (Google "oparr
P0420"). The code would return around 10-30 miles after clearing it.
Doubted anything was wrong with catalytic converters (California
model). Changed the downstream sensor to no avail around 9 months ago,
it had seen over 140,000 miles so it was probably due for changing
anyway. Upstream sensor had to be changed 20,000 miles earlier.

DMV inspection was due this month (Feb 2009) so out of desperation I
tried something that someone recommended for the same issue....Sprayed
about a half tin of Berryman's B-12 (same thing used to clean the IAC
valve) at the intake while revving the engine. This brought up just
about every emmissions code in the book (misfire, O2 sensor, mixture
too rich etc.). Also, changed the air filter and added some "snake
oil" to the fuel tank.

Well, after clearing codes and over 500 miles later, the CEL light
remains off and no traces of any codes. It passed the DMV inspection
on Feb 21. I'm now a firm believer in "snake oil" fuel system cleaners
for aging cars.
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Old 27 Feb 2009, 01:30 am   #2 (permalink)
johngdole@hotmail.com
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Default Re: '97 CAMRY 4 CYL: OBDII code P0420

Besides the problematic (Denso made) oxygen sensors on these cars, you
also need to make sure the engine is properly tuned -- for example,
timing, spark plugs, fuel filter, valve clearances, etc.

Sounds like in your case possible carbon build up over the years
solved by Berryman's were contributing factors.

These engines use multi-port injection, which means fuel is injected
into groups of cylinders and sits around the intake valves for a while
between cycles. (So I wonder if valve deposits and related rich
drivability problems were issues??)

But at least all is fine now!

On Feb 26, 2:14*pm, oparr <op...@hotmail.com> wrote:
> My CEL was on for about a year due to this P0420 code (Google "oparr
> P0420"). The code would return around 10-30 miles after clearing it.
> Doubted anything was wrong with catalytic converters (California
> model). Changed the downstream sensor to no avail around 9 months ago,
> it had seen over 140,000 miles so it was probably due for changing
> anyway. Upstream sensor had to be changed 20,000 miles earlier.
>
> DMV inspection was due this month (Feb 2009) so out of desperation I
> tried something that someone recommended for the same issue....Sprayed
> about a half tin of Berryman's B-12 (same thing used to clean the IAC
> valve) at the intake while revving the engine. This brought up just
> about every emmissions code in the book (misfire, O2 sensor, mixture
> too rich etc.). Also, changed the air filter and added some "snake
> oil" to the fuel tank.
>
> Well, after clearing codes and over 500 miles later, the CEL light
> remains off and no traces of any codes. It passed the DMV inspection
> on Feb 21. I'm now a firm believer in "snake oil" fuel system cleaners
> for aging cars.


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Old 27 Feb 2009, 01:36 am   #3 (permalink)
johngdole@hotmail.com
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Default Re: '97 CAMRY 4 CYL: OBDII code P0420

I'd use Bosch's planar type oxygen sensor, if available for the
application, over a cheap heated-thimble type.

Bosch planar type:
http://www.boschautoparts.com/Produc...nsors/PlanarO2

Read also:
http://www.motor.com/magazine/pdfs/022009_02.pdf

"Lazy oxygen sensors can distort the data and confuse the PCM. So if
the sensors are suspect, or their age canít be determined, replace
them. Even if you have to replace more than one, the cost to the
customer will most likely be less than the cost of a converter. The
precat oxygen sensor is also responsible for fuel calibration. This
promotes maximum engine efficiency, which also allows the catalyst to
perform at its peak efficiency. If the engine is not performing as
designed, catalyst efficiency will also suffer. "



On Feb 26, 2:14*pm, oparr <op...@hotmail.com> wrote:
> My CEL was on for about a year due to this P0420 code (Google "oparr
> P0420"). The code would return around 10-30 miles after clearing it.
> Doubted anything was wrong with catalytic converters (California
> model). Changed the downstream sensor to no avail around 9 months ago,
> it had seen over 140,000 miles so it was probably due for changing
> anyway. Upstream sensor had to be changed 20,000 miles earlier.
>
> DMV inspection was due this month (Feb 2009) so out of desperation I
> tried something that someone recommended for the same issue....Sprayed
> about a half tin of Berryman's B-12 (same thing used to clean the IAC
> valve) at the intake while revving the engine. This brought up just
> about every emmissions code in the book (misfire, O2 sensor, mixture
> too rich etc.). Also, changed the air filter and added some "snake
> oil" to the fuel tank.
>
> Well, after clearing codes and over 500 miles later, the CEL light
> remains off and no traces of any codes. It passed the DMV inspection
> on Feb 21. I'm now a firm believer in "snake oil" fuel system cleaners
> for aging cars.


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Old 02 Mar 2009, 01:29 pm   #4 (permalink)
oparr@hotmail.com
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Default Re: '97 CAMRY 4 CYL: OBDII code P0420

> Sounds like in your case possible carbon build up over the years
> solved by Berryman's were contributing factors.


Seems like it. Going to order some B12 fuel system clean-up and add it
to the gas tank every 3000 miles as they recommend.


On Feb 27, 2:30*am, johngd...@hotmail.com wrote:
>

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Old 02 Mar 2009, 08:06 pm   #5 (permalink)
johngdole@hotmail.com
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Default Re: '97 CAMRY 4 CYL: OBDII code P0420

I also heard about Auto-RX. I've never used it, so I don't know how
well it works. But sounds like it can help clean up the lube system's
varnishes. See:

"Auto-Rx Cleans Engine Internals, Transmissions, Power Steering,
Differentials, Seal Leaks and also takes care of Sludge/Heavy Oil
Burning."


http://www.auto-rx.com/


On Mar 2, 11:29*am, "op...@hotmail.com" <op...@hotmail.com> wrote:
> Seems like it. Going to order some B12 fuel system clean-up and add it
> to the gas tank every 3000 miles as they recommend.


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