Question about 2008 GMC Yukon Denali

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Check engine light continues to come on. Scanned and got Bad Bank 1 Code. Changed All four O2 Sensors. What else could it be?

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  • Keith
    Keith Oct 18, 2013

    Have Changed ALL four Sensors. Still having the Same problem.

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  • GMC Master
  • 22,326 Answers

Right check the O2 sensors for working by checking the wires with a multu meter ,although it can be checked with a code reader if set to read the PIDS ,this means that with engine running you read the readings on the code reader should be about 4.7v going up and down with RPM ,failing which on the O2 sensor their are twoi wires the same colour normally white or grey ,now check across these wires for a 12v supply with ignition on ,then get back to me as i dont iof this vehicle has 4 or 3 wires

Posted on Oct 18, 2013

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SOURCE: 2002 gmc yukon, rich fuel code, low fuel pressure @40

you may have two oxugen sensors on your yukon. if so the oxygen sensor that controls that bank may be bad. from what you mentioned in your complaint, it sounds like it is the oxygen sensor.

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SOURCE: code P0420 keeps reoccuring - catalyst below threshold bank 1

NEW GAS CAP same thing on 99 Tahoe GAS CAP

Posted on Mar 22, 2009

jturcotte
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SOURCE: 1998 gmc Sierra Engine light

Hi, there are a number of trouble codes associated with the O2 sensors. Some indicate a sensor failure and others indicate a different problem. Can you tell me the trouble code you are getting?

Posted on Jan 14, 2011

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1 Answer

Can an O2 oxygen sensor effect another sensor and give a false reading?


Check which side of your engine has cylinder #1. That side is bank 1. Bank 2 is the side opposite of bank 1. So bank 2 is not always passenger side. And since you seem to have extra O2 sensors, I would replace the other upstream and see what happens. Also the mass air sensor can give a trouble code issue to the upstream 02 sensors. Good luck. I've struggled thru this myself.

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If this is a V6 model, Bank 1 would indicate one side of the motor. Also, if it's the V6 model, I believe there are 3 O2 sensors, one per Bank, and one downstream(post-cat). If it is the V6 model, and it indeed is Bank 1, then just replace the O2 sensor, that's the most likely cause.

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i would start with o2 sensor that's after the cat and clear code! if still not good then move to the next one till you have it right!

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During inspection I found out that a o2 sensor was bad but i was reading up on them and aparently there are four o2 sensors. 2 upper and 2 lower. How am i suppose to know what one is bad? secondly my...


The check engine light is blinking usually because of a misfire which can cause damage to the cat. The blinking check engine light does not necessarily mean the the cat is damaged.

The first thing you need to do is find out what codes are causing the check engine light to come on. If there is an O2 code it will help you identify the O2 sensor. The sensors are divided into to banks. Bank one is the same side of the motor as the number one cylinder. Bank 2 is the other side of the motor. Then they are divided into sensor 1 and senor 2. Sensor 1 is always before the cat. Sensor 2 is always after the cat. So if you had an O2 code for the Bank 2 sensor 1 O2 sensor it would be the opposite side of the engine from the number one cylinder and the sensor before the cat.

IMO, your first priority should be to figure out why the engine is misfiring and causing the check engine light to blink. Solving that first may take care of the O2 issues or the O2 could be the issue.

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CODE P0421. DEFINITION-CATALYST EFFICIENCY LOW-BANK 1. EXPLANATION-THE OXYGEN SENSORS MONITOR THE CATALYTIC CONVERTERS ABILITY TO STORE OXYGEN. PROBLEM CAUSES- 1. CATALYTIC CONVERTER DEFECTIVE (FAILURE POSSIBLY DUE TO #2,3, OR 4) 2. ENGINE MISFIRE OR RUNNING CONDITION. 3. LARGE VACCUM LEAK 4. ENGINE OIL LEAKAGE INTO EXHAUST-VALVE GUIDE SEALS, PISTON RINGS. THE PCM HAS DETERMINED THAT THE WARM UP CATALYST EFFICIENCY FOR BANK 1 IS BELOW TRESHOLD FOR THE CURRENT ENGINE OPERATING CONDITION. (BANK 1 IDENTIFIES THE LOCATION OF CYLINDER #1, WHILE BANK 2 IDENTIFIES THE CYLINDERS ON THE OPPOSITE BANK).

replace O2 sensors, or your Catalytic Converter.

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to make you clear where does the oxygen sensors where is........... some have four, three or two, all O2 SENSORS ARE LOCATED AT EXHAUST PIPE. before and after catalytic converter,

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Your van has four o2 sensor's, the code should tell you which one is bad for exsample code should be like,
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P0136, P1131, and P1151 codes on Ford Expedition 2000 4.6L


Your auto has four O2 sensors. Two upstream and two downstream; With two banks. Bank 1, sensor 1...and bank 2, sensor 1 are the two upstream (exhaust manifold before the catalytic). Bank 1, sensor 2 and bank 2, sensor 2 (other side of catalytic)

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Code 1151= upstream; bank 2..sensor 1
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I wouldn't spend the money to purchase 3 sensors. Highly unlikely all three are bad; Cost is about $40/ ea.
Since there isn't a code for the cat's themselves, I would suspect the O2 circuit is malfunctioning. The rough idle is another clue.


Take an ohmmeter set it on X10 scale and measure the resistance from engine to body and body to negative post on battery terminal. You should read zero ohms (full needle deflection). If you do go buy two upstream O2 sensors. If you read
open or a high resistance run two straps from eng. to body...and body to neg.batt. post.

FixYaWIZ................saailer

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Hi:
I am pretty sure each O2 Sensor has it's own code.
If you have the code scanned again, it will tell you which one it is, bank 1 or bank 2 . before or after the Cat.

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