Camry :: When Drive Over 80 Mph Within 15 Minutes CEL Comes On With Code P0420


Sep 14, 2014

2006 Toyota Camry LE (4 cyl) with 149,500 miles. All maintenance up to date.

Over the past month, anytime I drive over 80 mph within 15 minutes, the CEL comes on with the code P0420. I read the code and erase it. The funny thing is typically I'm getting very good gas mileage during that tankful when the CEL comes on. I've read that it is likely the downstream oxygen sensor and I plan to replace it. (In February, I replaced the air/fuel sensor). My two questions are:

a) What is the part number for the oxygen sensor (non-California emissions)? I want to make sure I get the right part.
b) Why the CEL comes on after travel over 80 mph? Is this coincidence or is there a reason why this happens?

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Tried:
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-Spark plugs replaced around 40k miles ago
-Checked for leaking valve cover gasket (oil in plug wells) None

Can a clogged fuel filter cause this? At idle the car is fine, the symptoms seem to only occur when car is under load (In drive). My son drove this car an it always seemed empty meaning he never put much gas in it.

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Prius (Gen 2) :: 2007 - Code P0420 Comes And Goes?

I have a 2007 Prius/70,000 miles and live in NY. The Malfunction Indicator Lamp (Check Engine Light) came on back in May when I was visiting Texas and I stopped to have the code read and got a P0420 code - possible emission problem. As I was far from home I took a day to think about what I should do and by the next evening the light had shut off. Driving back to NY the following week the light came on again about 150 miles from home. Once again within a few days it had shut off. End of June I had the same thing happen - this time I took it to a Auto Part store and had them read the codes again. The guy there told me the only thing that showed up was some kind of emission error. Again within a few days the light went off. Just yesterday (August now) the light came on again. I've resisted taking it to the dealer because I know they will charge me $100+ just to plug it in and tell me what I partly already know. I've been reading up the P0420 code online however still have a few questions.

A. Is it normal for this code to go on and off repeatedly without me really doing anything?
B. Is there any way to figure out what the specific issue is without taking it to Toyota?
C. If it is the catalytic converter would I be covered under the Federal Emission Warranty? - which from what I've read is 8 years/80,000 miles?

The following is what the initial code printout read:
Troubleshooting P0420
OEM Brand: Domestic
Definition
Catalyst efficiency low-bank 1
Explanation
The oxygen sensors monitor the Catalytic Converters ability to store oxygen.

Probable cause
1. Catalytic converter defective (failure possibly due to # 2, 3, or 4)
2. Engine misfire or running condition
3. large vacuum leak
4. Engine oil leakage into exhaust-valve guide seals, piston rings

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I am unitronic stage 1, before going stage two i want to have the CEL under control so i can downgrade the flash and not trip CEL for smog.

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I keep getting the error code P0420. Cat below threshold.

I have replace both the front and rear O2 sensors and we reset the check engine light. While driving through the cycles to reset the sensors for them to be ready for DEQ, the check engine light came on again.

I am about ready to buy the Cat Converter, but it is really expensive and if there are any other things that I can try before replacing the Cat I would like to try that first. Any other issues associated with that code, or should I just replace the Cat Converter as my next step.

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Anyway to cut a long story short, two questions.

1) Car had P3190 and P0420 when I got it. Seller reset, drove home and within 5 minutes on the road the CEL was back on. Checked the codes at home and see only a P0420. Much to worry about? Seems this might be big (Cat) or small (O2). Car getting great mileage - 60mpg at 60mph and it seems to be running great. Should I worry or forget about it? Note I am in Florida with no inspections.

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-new battery (old one was 0.1 above fail)-all 6 spark plugs-catalytic converter-front oxygen sensor-oil filter-timing belt-pcv valve and breather hose (old one melted)-all 4 shocks/struts

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The last problem we had was P0420. We went to 3 different shops and nobody was able to fix the problem properly. It wasn't until the pcv valve and breather hose were replaced that the code disappeared. The valve was actually cracked and parts of the breather hose were melted. I can't understand why nobody noticed that.

I know there could be a lot going on, but I was hoping the possible problem could be narrowed down.

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So i've had this volvo for about 6 months now.I knew when I purchased it that the two codes being thrown were p0128-Engine coolant temperature, and p0420- Cat efficiency Bank 1.Inspecting mechanic said it needed a new cat to clear the p0420....I went ahead replaced the thermostat and changed the coolant to "fix" the p0128, and cleared the codes, I think the jiffy lube state inspector did not notice the that the catalytic converter test was Incomplete when he passed it. Lucky me I guess.

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