1998 Toyota Camry-P0303, P0325,P0420

nkboyd · **Joined:** Mon Feb 16, 2009 8:00 pm **Posts:** 2

My car('98 Toyota Camry 4 Cylinders) has the Check Engine light on. The OBD II code is P0303, P0325,P0420. The car is in a good driving condition. What shall I do? Does it need to change Spark Plug, Oxygen Sensor and Knock Sensor? Please Help!

Sponsored Links · **Joined:** 29 Jun 2004 08:12 pm **Posts:** N/A

Mohawkmtrs · **Posted:** Tue Feb 17, 2009 8:24 am

When was the last time a tune up was performed?

Also, it looks like it's time for a new cat. Make sure you buy a good quality one.

statty · **Joined:** Wed Feb 18, 2009 6:07 pm **Posts:** 9

agreed get a quality cat if going to keep the car.
the p0325 knock code may be result of misfire on cyl 3. fix that first then see if still getting knock sensor code.
tune up good first step.
if high miles may have an injector going bad.
goodluck

MR OConnor · **Joined:** Sat Feb 21, 2009 10:02 pm **Posts:** 2

Had an issue once with p0303 code. Turned out to be a cracked spark plug insulator. It went on long enough to carbon trace from the connector tip to the plug base, so it was easily recognizable. Just repalced the plugs as a set as you can't buy 'em individually anymore. Could have been a manufacturing defect, but more than likely I got the insulator bound at an angle in the socket when installing it just enough to give it a hairline crack.

I run a Toyota T100 with a v6 and have found that the gaps on the dual tip plugs used in this engine will expand quite extensively over time from the initial gap specs, like 15 to 30 thousandths over. Doesn't seem to affect its performance, but other engines may not perform well with such a variance. Rounded topped (domed) electrode tips, instead of a flat top, are a sure sign for replacement.

Have appreciated the info provided by this sites participants. It's been very constructive. Give and get.

Mike O

toyocam02 · **Joined:** Tue Mar 17, 2009 7:58 am **Posts:** 5

Hello,
I have a similar issue. In my 2002 Toyota camry 2.4 litre. I have a P0420 Catalist efficiency below threshold. No other codes. From what i'm reading here looks like I have a cat gone bad. My problem is that the code reader dosent tell me which cat. There are two cats on my car. One is part of the exhaust manifold and the other after that connected with the flex pipe. My budget dosen't have enough in it to buy two cats (barely enough for one). Does anyone know how I can figure out which one it is :?:

I have also read that the P0420 can be for a bad O2 sensor. Any truth to that ?

Thank you for any and all help.

Mohawkmtrs · **Posted:** Tue Mar 17, 2009 8:29 am

You didn't mention what engine you have.

If it's a 4 cyl., there is only one cat...the other thing may be a resonator.

If it's a V-6, it's the cat on Bank 1.

98% of the time, a P0420 indicates the the cat is gone.

Again, make sure you get a good, quality cat.

toyocam02 · **Joined:** Tue Mar 17, 2009 7:58 am **Posts:** 5

Mohawkmtrs wrote:

You didn't mention what engine you have.

If it's a 4 cyl., there is only one cat...the other thing may be a resonator.

If it's a V-6, it's the cat on Bank 1.

98% of the time, a P0420 indicates the the cat is gone.

Again, make sure you get a good, quality cat.

Sorry, I have a 2002 Toyota Camry with the 4 cylinder 2.4 motor. There are unfortunately two cats on this. One is part of the exhaust manifold just before the flange. The other is a few feet past the flex fit, about halfway down my car. I checked with the dealer just to be sure. My car is 50 states legal not California emissions.

1998 Toyota Camry-P0303, P0325,P0420

Who is online