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2014 Mitsubishi Outlander P2096: Lean Fuel Mixture


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Mike_L
New User

Oct 23, 2021, 6:58 AM

Post #1 of 3 (290 views)
2014 Mitsubishi Outlander P2096: Lean Fuel Mixture Sign In

Hello all -

I have a 2014 Mitsubishi Outlander, 4-cylinder, ~115k miles and it has a check engine light. The code is P2096, Lean Fuel Mixture. There are no other codes.

The mileage and power seem fine to me so I was skeptical that it was actually a lean mixture. Here's what I've done so far:
- Replace the air filter (just because I was due for one, not because I had much hope that it would solve this problem)
- Replace the downstream O2 sensor with a Bosch universal sensor. I was hoping this would be the issue.

The downstream sensor reads about the same before and after replacement (usually very close to 0 Volts but goes up to ~0.75 Volts when you rev the engine). The upstream sensor just shows up as N/A on the scan tool but I've seen videos on YouTube where other Mitsubishi's show the same (I think) so that may be normal.

Any advice on things to try next? I've thought about going ahead with replacing the upstream sensor but thought I would ask here first. Is there any easy way to check if it's a vacuum leak somewhere?

Hobbyist auto repair guy here, so any advice would be appreciated.
Thanks. Mike


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 23, 2021, 8:13 AM

Post #2 of 3 (288 views)
Re: 2014 Mitsubishi Outlander P2096: Lean Fuel Mixture Sign In

First, you have to understand how this system works and what the code means.

The front sensor is called a Linear air/fuel ratio sensor and the downstream is called a heated oxygen sensor. These sensors do not read a consistent voltage. They are designed to constantly cross high,low,high,low.

Normally the front sensor is totally responsible for fuel mixture and the downstream merely monitors Converter performance. Not in this case. When the front sensor stops responding, the downstream takes over.

It's not recommended to use universal sensors as they do not match the original specs.

The diagnostic tree is pretty short on testing and big on parts changing.

It states to start with the Linear air/fuel ratio sensor and clear the codes. If the code comes back, replace the downstream sensor. If that fails too, you are looking at an injector, wiring or a computer.

Surprisingly, actual lean fuel mixture is not mentioned in the troubleshooting.
This is what they said.

TROUBLESHOOTING HINTS (The most likely causes for this code to be stored are: )

- Linear air-fuel ratio sensor failed.
- Heated oxygen sensor (rear) failed.
- Injector failed.
- ECM failed.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Oct 23, 2021, 8:15 AM)


Mike_L
New User

Oct 26, 2021, 6:27 PM

Post #3 of 3 (229 views)
Re: 2014 Mitsubishi Outlander P2096: Lean Fuel Mixture Sign In

Thanks for the reply. I'll try replacing the upstream sensor to see if it goes away, then it's probably time to turn it over to the professionals. Thanks again.






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