Question about 2006 Scion xB

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Oxygen sensor bank heated

Where is the location of circuit fuse for front O2 sensor

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  • Scion Master
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In fuse holder under hood

Posted on Nov 24, 2013

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Posted on Jan 02, 2017

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airjer995
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SOURCE: 02 sensor stuck lean on bank one

It is possible. What I would do is look at the O2 sensor data on the scan tool. If it is stuck lean than I would give the engine a couple shots of carb spray through the air tub. If the sensor switches to rich than I know the sensor is good and there is a high probability that there is a vacuum leak. If the sensor does not switch than I know the sensor is stuck lean and needs to be replaced. Let me know if you have any questions and I'll do my best to answer them. Thank you for using FixYa.com!

Posted on Feb 02, 2012

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Recently - asked about OBD2 code 0053. Advised to check heater fuse B1S1but none is listed in the care manual or diagrams. Both O2 sensor fuses are good... What next?


O2 sensor's don't have a fuse , except for the heater circuit. PCM - engine computer supply's five volt's , signal return and ground . All are connected at the PCM . The fuse's you are calling O2 sensor fuse's are for the heater circuit . The PCM controls the O2 heater circuit by pulse width modulation ,do you know what that is .There is a transistor inside the PCM that toggles the ground on an off to control the heater circuit . Unless you know automotive electrical circuit testing an testing PCM input's an outputs ,your best bet , take your vehicle to a qualified repair shop .

Pulse width modulation Pulse width modulation

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Fuse location for bank 1, sensor 2, on a 2005 Pontiac G6 3.5 l


Fuse # 6 EMISSION 1 10amp. Under hood fuse box . This fuse power's all O2 sensors heater circuits . The O2 part is controlled by the PCM - engine computer .

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O2 heater circuit fuse location 99 Mercedes Benz s420


If the circuit is bad for a heated o2 sensor its not tbe fuse its a bad o2 sensor. Replace the sensor and you shoukd be fine

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What trouble code deffanition 147


DTC P0147 - 02 Sensor Heater Circuit Malfunction (Bank I Sensor 3)
O2 (Oxygen) sensors contain a heating element that allows the sensor to reach operating temperature quickly. This lowers emissions since it allows the engine to reach closed loop faster and also allows the engine to stay in closed loop at idle. The heater circuit is supplied a 12 V battery feed from the PCM or ignition circuit (depending on model) and a ground. The PCM (powertrain control module) monitors how long it takes for the sensors to become active after engine start-up. If it takes too long for the o2 sensors to reach operating temperature, this P0147 can set.

For this particular o2 sensor, there may be no noticeable symptoms other than:
MIL (Malfunction Indicator Lamp) illumination
Poor/ rough idle

Potential causes of an P0147 code include:
Bad o2 sensor heater circuit
Bad o2 sensor
Wiring harness problems

Possible Solutions:
Unplug the Bank 1, 3 sensor. With KOEO (key on engine off) use a voltmeter to check for battery voltage present at the o2 sensor connector (PCM side). (You can also do this with a test light. Connect to ground and touch lead to heater circuit supply. Light should illuminate with KOEO) You should have battery voltage present.

a. If voltage is present, check the ground side of the heater element also making sure a good ground is present. If it is, check for any faulty connections & then replace the o2 sensor. If you don't have a good ground, then there is an open in the ground circuit somewhere that will need to be repaired. Look for wiring harness contact with exhaust components or broken/missing connectors, etc.
b. If battery voltage isn't present with KOEO, check for a blown fuse supplying the heater elements. You may need to get a wiring diagram for this. If the fuse is blown, you'll need to check for a short to ground on the battery supply circuit before replacing the fuse. If you find none, and replacing the fuse re-establishes battery voltage at the o2 sensor connector, then the o2 sensor may have shorted internally, blowing the fuse. Replace it & recheck. (NOTE: it's possible for an o2 sensor's heater circuit to be open/shorted and the o2 sensor to still function).
c. If you have no battery voltage present with KOEO and there are no blown fuses supplying the heater circuit, then check for an open on the supply circuit. You can do this by ohming the circuit with the o2 sensor unplugged and the PCM unplugged. Repair and recheck.

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Thank you for using FixYa, have a nice day.

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P0135....O2 Sensor Heater Circuit (Bank 1 Sensor 1) heater in the O2 sensor has packed up first sensor before the cat

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I have a 2000 Golf GTI VR6 and I am trying to find the fuse for the oxygen sensor, I was told the fault, Found code for O2 sensor heater Bank 1 sensor 1 open circuit. Front O2 sensor failed. Might be the...


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2000 sk8 with trouble code 1647


The DTC code P1647 indicates that there is a issue with the O2 sensor bank 2 upstream. What caused the code could be a heater failure to the O2, Sensing circuit failure (Short circuit to ground, short circuit to hight voltage, or open circuit). Last would be ECM failure but that's rare. The Bank 2 is the radiator side, check the wire harness to the O2, The harness to both upstream and downstream O2 sensor are connected to a bracket in front and below the battery. Look for corrosion and follow the harness for any breaks that would cause a short in the system. Also check the fuse to the O2 sensor heaters, not sure which fuse it is but check all the fuses in the fuse box under the hood. If everything is ok then most likely the O2 sensor needs to be replaced. Good luck and hope this helps.

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