My check engine light came on recently and the code indicates Bank 1 sensor 1 is the problem. It is my understanding that there are 3 or 4 Oxygen sensors on 2004 Avalon, I can see one right on the exhaust manifold another is around the firewall and a third I saw after the catalytic converter. Can you tell me the location of bank 1 sensor 1.
O2 Sensor Bank 1 Sensor 1 on 2004 Toyota Avalon
by gciano in Levittown, NY on June 07, 2010
ANSWER by mastertech6371 on June 07, 2010
may not be the o2 sensor. just because there is a code does not condemn the sensor. did you have the code pulled or get a full diag?? it will be an expensive guess as these are fuel/air ratio sensors that are pricy. bank 1 sensor is the one by the firewall. Roy
ANSWER by Visitor on April 03, 2011
bank 1 sensor 1 is the first sensor off the manifold
3 coils, secondary test reads 13.3 on all 3 coils.Both O2 sensors changed 6 months ago, mileag...
had a scsn said o2 sensor sensor 1 bank 1,replaced sensor about 2 wks ago,lite went off 2 days came back on. scan also said heater circuit malfuntion.
just to remove chk engine--trac off and vsc lights from staying on--how urgent is it to replace