Bought my 2003 Sienna used from dealer, was really excited since I owned a Camry before and loved the quality, first year engine light came on had to change something in emission system, cost me over $400, year later engine light came on again this time rear airfuel ratio sensor, down stream oxygen sensor and lower catalytic converter $1197.62, I bought this mini van because I trusted the toyota brand, total disappointment, next time Honda.
I went through the same thing with my 2001 XLE.
I gave up and drive it with the engine lights on.
Now I won't have warning about other problems but no amount of money will fix the exhaust.
Turns out it is a very common problem - sensors are too sensitive.
I had the exhaust modified by someone I trust so I know it is safe and gas mileage is good but the light will never go off. Other than that I have been very happy with mine 175,000
and still solid.
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