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2005 Chevy Silverado O2 sensor

I have replaced all four O2 sensors with OEM parts but the codes still say they are failing. Is there a fuse that coul be blown. If so where is it. If not what else could be the problem

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  • Anonymous May 13, 2009

    I have the same problem. All 4 O2 sensors say they are bad, so I checked the (15 amp) fuse under the hood on drivers side. It shows to be good also. Is there another relay/fuse that would control all the sensors or is there a wiring issue somewhere?



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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

Posted on Oct 16, 2008


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Where are theOBD O2 sensor heater code po161 for a 1998 chevy. Silverado v 6

That is P0161 (letter "P" and four numbers)
P0161 Oxygen O2 Sensor Circuit Low ( engine cylinder bank 2 sensor #2)
What does that mean? This diagnostic trouble code (DTC) is a generic powertrain code, which means that is applies to OBD-II equipped vehicles. Although generic, the specific repair steps may vary depending on make/model.
It basically means the PCM detected either an excessive current draw, or an open or short in the circuit powering the oxygen sensor's heater circuit. This is in reference to the Heated Oxygen Sensor (2) located rear of catalytic converter (Bank 2).
A code P0161 may mean that one or more of the following has happened:
  • HO2S heater power circuit open
  • HO2S heater ground circuit open
  • HO2S signal tracking (due to oil or moisture in the connector)
  • HO2S is damaged or has failed PCM has failed

Nov 29, 2016 | Cars & Trucks

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Trouble code p0134, p0135 p0053 p0030

P0134 - O2 Sensor Circuit No Activity Detected Sensor 1 Bank 1
P0135 - O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 1
P0053 - O2 Heater Resistance Bank 1 Sensor 1
P0030 - O2 Heater Control Circuit Bank 1 Sensor 1
You need to replace the O2 Sensor Bank 1 Sensor 1
Carquest can help you get the correct part and help you locate it.

Apr 01, 2014 | 2006 GMC Envoy Xl

1 Answer

2005 silverado 1500 replaced both front incriminating sensors. Still have a fault code for sensor 2.

Do you mean O2 sensors? There are 2 O2 sensors that run the engine right and left banks. There also is one behind the catalytic converters that monitor the health of the converters but have nothing to do with engine efficiency. Also make sure the converters aren't becoming restricted or partially blocked. This condition would screw with the O2 sensors and cause a code. Take it to a muffler place if you suspect the converter is plugged. They have a test they can do to determine that. Lack of power at full throttle indicates a plugged converter.

Mar 12, 2014 | 2005 Chevrolet Silverado 1500 2WD

1 Answer


Well this wasn't what I expected to hear. Your car is only two years old. My first question is, Isn't this car still under warranty? To get back to your request, P0050: The ECU detected that the upstream O2 sensor heater failed. The heating element is inside the O2 sensor and when the car's ECU decides that it wants to turn the heat on, it closes the ground inside itself. Without diagnostic equipment you are not going to find out what failed. there are only four possible causes. The wiring to the O2 sensor is damaged, The fuse to the O2 sensor has blown, The O2 sensor is broken, or the ECU is partially damaged. Well I hope this helps. If you have any other questions please ask away. Be detailed so I can help you better, good luck.

Mar 03, 2014 | 2012 Hyundai Accent GLS Sedan 1.6L 4-cyl....

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2002 chevy silverado i have 3 codes. P0137, P0160, P0300

mean you replace front O2,codes mean back O2 sensor,spark plugs,fuel filter,could be battery[300].

Feb 27, 2013 | 2002 Chevrolet Silverado 1500

1 Answer

P0160 code repair

Always buy OEM sensors.

May 07, 2017 | 1999 Nissan Maxima

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Enegine code p0141

Depending on the make model and year, code 141 is for a problem with the heater circuit for the O2 sensor bank one sensor two. Sensor two is after the catalytic converter.
The problem could be the sensor or the source of power for the heater circuit.

Jan 19, 2013 | Cars & Trucks

1 Answer

2003 s-10 4.3....truck was running fine, check engine came on, usually gas cap...after couple days of not going out i obd2 it. codes.135,141, 154 and 155 3 of where double. says check circuit fuse? any...

You're making the most common DIY mistake in thinking that whatever part is listed in the trouble code is what you need to replace. In your case the most important codes are:
P0135 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

Oxygen sensors don't work well unless they're up to a certain temp. That's why they have heaters. So these codes are telling you there's a problem with the O2 sensor HEATER circuit. That could be a blown fuse or a problem with the wiring harness. Since the heaters aren't working, it makes perfect sense that you'd get the two other codes. Check the fuse for the O2 sensor heaters. Oxygen fuse in underhood fuse box (20A). If it's blown, replace it. If it blows again, you've got a short somewhere. Start by unhooking the all the O2 sensors. If the fuse doesn't blow, plug them in one at a time. Get it?

Aug 27, 2017 | 2003 Chevrolet S-10

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