There are 4 two in front of the cats and 2 after the cats
There is no fuse for the O2 sensor.
2001 Tundra v8 code P0135 is a o2 sensor heater circut( Bank1 sensor 1).
2004 vw beetle up stream o2 sensor location
The O2 sensor heater circuit helps warm up the O2 sensor. The purpose of this is to allow O2 sensor to get to normal operating temperature without having to wait for exhaust pipes to warm up so it can give accurate readings. It is built into O2 sensor.
p0122 code
the o2 sensor is located at the left side of the engine towards radiator and is the upper o2.
just after the cattalitic converter
That is passenger side after the catalyst.
Oxygen (A/F) Sensor Heater Control Circuit Low (Bank 1 Sensor 1)symptomsOther than the MIL light illuminating you may not notice any performance issues.causeA short in the O2 sensor heater circuit or the sensor itselfA faulty O2 sensor heaterWiring or connectors are broken or frayed to the sensor or relayBad PCM or ECMThe fixCorrect wiring short or loose connector found in inspection.and/orReplace the bank 1 sensor 1 O2 sensor
is oppiste to radaitor exactly.
The O2 sensor after the catalytic converter.
O2 Sensor malfunction, Bank 1, Sensor 1