When I drive my Highlander over 100 miles at highway speeds, my service light comes on. I have not had repairs done mainly because estimates from a Toyota Dealer were over $2000. More recently the estimates are down, under $400.
The dealers say that the problem is with the catalytic converter. But if we drive locally for a while the light goes out. We are also aware that Toyota has issued recalls on the On Board computer.
The question is should we have it repaired? Is it possible that that we are just getting a false error report ?
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If the underlying cause of the light is taken care of the OBD check engine light will go off after 6 warm up/driving cyclec or one within 50 miles of highway driving at a steady speed. If its still on you still have the problem/malfunction.
the catalytic convertor not reaching operating temp , this may indicate that the o2 sensors are malfuntioning in some way , have the OBD codes read to narrow down the issue , i would try a fuel addative that cleans the catalytic convertor etc ,give it a good run at a highish speed if possible (50-100 miles ) as may just need the o2 sensors cleaning off of carbon deposits etc
The converters generally fail only after the truck has been running rich. I would not replace them until certain the engine is running properly. There is no harm to the car to drive with these converters. Was there any history of rich operation codes?
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.
code p0420 refers to catalytic converter system bank 1 --efficiency below threshold ===causes -- catalytic converter ---wiring---HO2S 2 sensor
The cheapest part to replace is the HO22S sensor so I would do that first. Bump the cat converter soundly with the heal of your hand and if it rattles it needs replacing as it will be cracked internally. Dismiss any tinny rattle as that will be the heat shield loose
The time taken to replace both in an accredited shop will be less than 1 hour so it may pay to shop around and compare prices on the converter and labour costs.
Well, the actual procedure is to drive the van far enough to let the engine computer sample a wide range of conditions. The standard method is 100 miles at various speeds including highway and city driving. You could do it in 30 or 50 mile runs but it needs to be over 50 miles total.
A p0420 sets after Engine and catalyst are warmed up, vehicle driven within set vehicle engine speed range and waveforms of heated O2 sensors bank 1 sensor 1 and bank 1 sensor 2 have the same amplitude. Catalytic convertor and O2 sensors need to be tested
the light has to be reset you serviced the car before it was time and the light was not reset then. on the highlander im not sure how to reset it im thinking that all you have to do is turn the key to the on posistion and step on the gas pedal 3 times or you have to push the trip counter in and hold it for 15 seconds if neither one of these works take it to your service center they should be able to reset it for free.