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I need to know what fuse is for the o2 sensor

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  • Chevrolet Master
  • 2,101 Answers

There is no fuse the o2 sensor is bad

Posted on Nov 05, 2012

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Posted on Jan 02, 2017

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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

Oct 25, 2017 | Cars & Trucks

1 Answer

Engine fuse diagram


The O2 sensors are not connected through any relays. What is the problem that you are trying to solve. I do not believe the diagrams can assist you with O2 problems but I have included them. Please elaborate on your problem and I'm sure I can direct you to a solution.



Locations of fusible link, junction and relay block:
8_22_2012_2_03_25_am.jpg


Fusible link block:
8_22_2012_2_03_37_am.jpg


Junction block:
8_22_2012_2_03_47_am.jpg
Relay block #2:
8_22_2012_2_03_57_am.jpg

Relay block #3:
8_22_2012_2_04_14_am.jpg

Aug 22, 2012 | 2004 Toyota Sequoia

1 Answer

Need to know location for oxygen sensor fuse


o2 sensor recieves its power from the pcm(powertrain control module).If you have no power at the o2 sensor the you will need to check the circuit between the pcm and sensor.

Jan 30, 2011 | Toyota Tundra Cars & Trucks

1 Answer

Po147


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.

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

Causes: 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.


Hope helps (remember to rate this answer).

Dec 31, 2010 | 2000 GMC Jimmy

2 Answers

Code error number p0135


P0134....O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)


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

Nov 27, 2010 | Jeep Grand Cherokee Cars & Trucks

2 Answers

I need to know what the definition for fault code


The #2 O2 sensor on the cataylitic convertor,could be caused by a bad sensor or bad convertor.

Jun 22, 2009 | 1998 Jeep Cherokee

1 Answer

2005 Chevy Silverado O2 sensor


I 1st need to know the codes, the O2 heaters are fused, but without the codes don't know, check the fuse box for the O2 heater fuse, if it is not blown I will try to make out what is wrong from the codes

Oct 16, 2008 | 2005 Chevrolet Avalanche

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