Nov.2009, 131K miles, dealership analyzed problem and could find no reason. They contacted Tech Support Cost $89.95
11/17/09, dealership told me car possibly needed ECM replaced, but not sure. They wanted the car for the day with total costs possibly $2000 or more.
I suspect the ECM may have been the problem since initial P0420&P0430 codes appeared in May 2005. Contacted Toyota Customer Support in Calif. Was told they would do nothing more and advised me to buy a new vehicle. Go Figure.
I really need help. These are the only error codes this car has ever had and it runs great. However, it won't pass NC state inspection.
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Those cars are notorious for engine problems unfortunately. The exhaust valves tend to warp from heat after around 200k miles. Therefore throwing the O2 codes. Best outcome and cost effective thing I can recommend is replacing the engine with a new or low mileage engine.
P0420 & P0430 You need new catalytic converter
The P0430 check engine light code, like P0420, means the catalyst system efficiency is below the required threshold. Simply put, this means your car is adding more pollution into the air than it's supposed to.
Sounds like a ECU problem. The main computer. Take it to a Hyundai dealership and have them check the computer. You don't say how many cylinders if the cylinders are next to each other could have engine or gasket damage
I just looked those codes up and the PO420 states that your Catalytic convertor is bad. If the other code was supposed to be PO300 that states multiple cylinder misfires. It's very possible that the misfires ruined the convertor.
Yeah Toyota is aware of this situation.Production changes have occurred to correct this condition.
You did the right thing to take it to the the dealership because when they pulled the code p0741 they had to apply the Toyota Technical Service bulletin TC008-04" to your vehicle.
They had to perform several tests and since you said they replaced the ECU for free it was because your vehicle was lower then 5 years old and less then 60,000 miles. This TBS is covered by the powertrain Warranty. They had to replaced the ECU with an updated unit, and that particular warranty is in effect for 96 months or 80,000 miles. Your car should be back on the road running like a champion and you should NOT have the same code again.
that is bollox,the dealer has 30 mins to recalibrate the system or it will shut down and need all he said,is he for real a mazda dealer.........or are you rich looking????? get it to another dealer,ask them to get 2 keys and recalibrate(assuming the first dealer has not caused a meltdown of the system.....)the problem you may have is they may not know about the 30 min rule...its to stop thieves from changing keys on stolen cars.......
Check engine light with no codes usually means a PCM reset is happening. EBP shorting, ICP shorting, aftermarket "performance chip". PIDS need to be monitored to eliminate sensors. IDMs (Injector Driver Modules) can also cause this. IDM's are separate from the PCM/ECM (engine computer).
misfiring can cause a P0420 code.
I would recommend a set of honda plug wires and plugs if the P0420 code returns.
I have used bolt in aftermarket bolt in catalytic converters but don't remember the brand name they fit ok and i have had 1 or 2 return with a P0420 code out of about 20. I have never replaced the oxygen sensor on a civic like yours.
I always fix the misfire problems, reset the computer, and have the customer drive it and see if the code p0420 returns. 50% don't have the P420 code return. drive it and see what happens and go from there.
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