Question about 2000 Toyota Avalon
Changed O2 sensors. new air filter, fuel filter. checked for vacuum leaks. visual inspection,
Do you have a wiring diagram(s)? Find one,if not.
All data is helpful,but they charge $26.95 for a year.
Free is better.
Check for recalls on your model. NHTSA.
Check PCV and EGR valves for leaks,vacuum booster and...More.
Circuit voltage on harness side,not with an ohm meter at component.
You may need a more expensive diagnostic tool.
Get into an Avalon forum to see if that code has been difficult to diagnose.
Posted on Nov 11, 2014
Testimonial: "No, it run perfect, it passed emissions except for the fact the fix engine lit was on. I run synthetic oil, no leaks. burns no oil between changes which is 8000 miles. runs a little rich. Its responsive, and powerful, just says I have open circuit etc,"
If Emissions are high, is it burning oil? Do you have to top up the oil regularly?
could be a sign that the engine is dying, and would need to be replaced. If it can't pass emissions, then i wouldn't worry about the electrical issues, and scrap the car.
Posted on Nov 11, 2014
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Posted on Jan 02, 2017
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HO2S-21 (Bank 1 Sensor 1) Heater Circuit Malfunction
HO2S heater control circuit is open or shorted to ground.
HO2S heater power circuit open between the heater and PCM.HO2S heater is damaged or has failed.PCM has failed (it controls the heater with a duty cycle signal).The sensor is on the passenger side,that is cylinder number one.
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