Q: Oxygen sensor all over the place with readings

asked by on November 19, 2017

My 2004 infiniti g35 sedan has been acting really weird I replaced he air fuel ratio sensor it says that was going bad on bank 1 sensor and bank 2 sensor 1 but now it's saying bank 1 sensor one is broken again my check engine light cones and goes sometimes it takes a while before I see it again but when I do see it it's a different code it's p1167 saying my rear oxygen sensor are going bad I have obd2 plugged in and bank1 sensor 1 voltage fluctuate like normal bank2 sensor 1 fluctuate as normal when go to look at my rear oxygen sensor voltage the don't move there stuck right at 280v even while driving there stuck on 280v I can start my car in the morning they still stay on 280v the front air fuel ratio is moving and fluctuateing but my rear won't move anymore did the rear oxygen sensor just go completely out and can that be a cause for it bouncing around with codes

My car has 142000 miles.
My car has an automatic transmission.

Check Engine Light is on Inspection $79.99 - $99.99 Get a Quote

Oxygen sensors that are in-line after the catalytic converter (i.e., downstream sensors) should output a relatively steady voltage. The purpose of the downstream oxygen sensor is to monitor the efficiency of the converter rather than provide feedback to the the PCM regarding the air/fuel ratio. With regard to the code P1167, that code can set due to problems with the sensor or the wiring harness although a faulty sensor is the most common outcome. If you suspect out-of-range or erratic readings from these sensors, you can request a check engine light diagnostic and a certified mechanic from YourMechanic will resolve this right at your location. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Cut off while driving

Based on the information you provided, it does seem like your clutch switch may be faulty. You may have another cause for the no-start. Read the DTC's (Diagnostic Trouble Codes) to determine if you have another component that needs testing....

timing control valve

First, there are many different reasons you might get a timing over advanced code. The problem could be anything from a stretched timing chain to a failed actuator. The timing control solenoid valve is turned on and off by the...

Where are the crankshaft position sensor circuits A and B on a 2002 Oldsmobile Intrigue 3.5 L

There are two different crankshaft position sensors on your vehicle, one designated "A" and the other "B". Both of these sensors are mounted to the engine block. The two circuits that you are referring to run from the sensors (the...

2000 Chrysler 300m will not start because of the anti theft system

You can refer to YourMechanic's instructions to de-activate the engine immobilizer system. You should also consider the possibility of a weak battery, excessive voltage drop in the starter circuit due to poor electrical connections (be sure the ignition switch was...

no heat coming out of heater

Hello, thank you for writing in. Check the radiator hoses as well, and make sure both are warm if not hot. If the engine itself is running too cold, by the time the coolant gets to the heater core it...

Would a knock sensor on an 04 infinity cause it to not star?t

Hi there. The knock sensors are designed to produce a voltage when they hear a knock noise from the engine internal parts, so I'm not quite sure if a faulty knock sensor would impact the starting ability on the vehicle....

2004 Ford escape motor swap

Hi Chase. Thanks for your question today. Unfortunately, we really can't help you with this, as it's not a service that our mobile mechanics offer or something we specialize. Your best option is to try to locate a Ford engine...

On interstate, car severely vibrated and pulled to left

Hi there. There is indeed a recall for this exact issue - it is #06186 and it calls for crossmember replacement. I recommend you present this recall to the dealer so they can make things right.

When one outer tire rod goes bad do you need to replace all the other 3?

There is a test protocol in the factory service manual that is relied on to determine if a tie rod end is "worn out". Per the protocol, if it turns out that only 1 tie rod end is worn out,...

Related articles

A Buyer’s Guide to the 2012 Infiniti QX56
If If you want an SUV that offers comfortable seating for the entire family, a luxuriously smooth, enjoyable ride and the ability to tow all those toys when you go on vacation, the 2012 Infiniti QX56 might be your answer....
A Buyer’s Guide to the 2012 Infiniti G
The The 2012 Infiniti G is a sporty luxury sedan that has the looks, the power and speed, and the price that’s right for many buyers. It offers great handling, and aesthetics that will turn heads. Key Features The vehicle...
Top Automotive News & Stories: September 24-September 30
Angry Civic Type R, 350 special edition Ferraris, Infiniti variable compression tech, Mercedes' electric future, and more.