Toyota Camry P01135 A/F Sensor?

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declain

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Two questions:

1) Is it typically the one located in the front or the rear of the engine? Does anyone know?

2) How bad is it to not replace?
Again, this is the Auto/Fuel Ratio sensor, NOT the 02 sensor. Toyota's have an O2 sensor, which this is not, and two A/R Sensors, one in front, one in back
 
Most likely you have a bad oxygen sensor. This would be the first oxygen sensor if you have more than one meaning the one closest to the engine and BEFORE the catalytic converter. They're pretty common and inexpensive enough where I'd recomend changing that first and see if the light goes out on it's own.

If it doesn't then bring it somewhere for diagnostic. Bringing it there first will end up costing you more for the sensor plus the time it took them to confirm it IF it is the sensor which it most likely is.

If you put a sensor in it and it doesn't fix it then you'd have to have it diagnosed plus be out whatever the sensor costs which is also bad but then at least you have a new sensor to show for it and most likely it WILL fix it. It's a risk either way but I recomend throwing a sensor at it first if its in the $100 price range.Your mpg will decrease a littl bit that is about it and this issue won't damage your engine or transmission. sensors are not that bad just try to stay away from the dealer cause they mark everything up.

declain-An Air Fuel Ratio Sensor is also known as Wide Range Oxygen Sensor so you get a thumbs down
 
front main o2 sensor faulty signal. The o2 sensor is normally located in front of the cat converter. Some cars have them instslled in the exhaust manifold instead. This is a mfg. specific code and not a normal obd2 code. Call the service manager at a Toyata dealer and ask for the exact location.
 
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