My sienna drives fine but it sometimes when I start the car, it dies off after a few seconds, especially during humid days. It takes several tries to start the engine at a smooth pace then it won't be shaky and die. The check engine light indicates a catalytic converter code even though I have it replaced years ago. What could be the problem?
Could be the ( warm up 02 sensor)
SOURCE: My engine in my '03 toyota matrix xr dies.
check the mass air flow sensor it is hooked with air cleaner
SOURCE: 2000 Toyota Sienna Stalls while driving
yes i would say to check the parts yourself and save some money the fuel filter should be located at the rear firewall of the engine there is a hose going into it and one coming out on the new one there is generally an arrow to show fuel direction spark plugs you will find easy enough ignition coil is on the side of the body it is a round thing with usually four wires going into it and a heavy wire coming out from the top check it after the car has been run for a while if it gets hot that could well be your problem also there is a resistor under neath it same with that the vacuum hoses are small (thin) rubber hoses check to see if they are cracked on the ends if they are then replace them the air sensor is probably on the end of the air intake the large metal/plastic scoop hope this helps regards Jim
SOURCE: '99 Accord: P0420 and Sometimes Engine Hesitation & Rough Idling
If the converter is failed (i.e. plugged) it can cause drive-ability problems (i.e. the engine can't get the exhaust out like it normally can). FYI, http://p0420.com
Fix the known P0420 code first, then if the rough idle, etc continues, continue diagnosing. IMHO, don't worry about the MAF, etc. until you fix the "known" problems.
SOURCE: I am being told I
First, what are the codes?
Secondly, there are no codes that specifically indicate a failed catalytic converter issue.
A code relating to an oxygen sensor may not indicate a failed catalytic converter(s). It may be a defective oxygen sensor.
There are 3 catalytic converters on this model. One is connected directly to the right exhaust manifold, one is connected below the left exhaust manifold and one is connected under the vehicle before the two mufflers.
The last oxygen sensor (beyond the catalytic converter under the vehicle) is the one that compares the oxygen level in the combustion by-products for legal pollution requirements. It is screwed into the exhaust pipe and its wiring travels up into the vehicle through the floor and making a connection under the passenger front seat then to the computer for analysis.
A code relating to an oxygen sensor may indicate a failed oxygen sensor heater circuit in the oxygen sensor. This does not mean that the oxygen sensor is defective, only the oxygen sensor heater circuit.
If a catalytic converter is clogged, you should experience performance problems.
In addition to the check engine light being on, are you experiencing any performance problems?
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