• Welcome Visitor! Please take a few seconds and Register for our forum. Even if you don't want to post, you can still 'Like' and react to posts.

Bank 2 rich, bank 1 runs fine,

Ohhnulix

Member
Joined
Dec 9, 2020
Messages
36
Reaction score
5
Points
8
Location
Dade city
Vehicle Year
2002
Make / Model
Ford ranger
Transmission
Automatic
My 02 4.0 sohc started throwing a code for a rich code on bank 2, but only bank 2, I’ve yet to find any sort of reason for it, as most issues should be for both banks, any recommendations?
 


RonD

Well-Known Member
Joined
Jun 2, 2012
Messages
22,018
Reaction score
5,332
Points
113
Location
canada
Vehicle Year
1994
Make / Model
Ford
Transmission
Manual
You can get an Bluetooth OBD2 unit for under $20, like ELM327

If you have an OBD2 reader then hook it up and start engine
Engine has to be warmed up before O2 sensors can work
Select live data
And look at STFT bank 1 and 2
Drive it while you watch the STFTs
If both are showing "-" numbers then BOTH banks are effected, but only bank 2 has set the code so far, so not "running fine"

And check O2 sensor voltage sensor 1's, there are two sensor 1's, those are the upstream O2s
expected is 0.3 to 0.5volt, higher than 0.6v is Rich


And look at LTFT what's the number?
Usually a code is not set until -20 or +20 is reached

How old are the O2 sensors, they last 12 years, they run out of the chemical used to detect Oxygen, only sensor that actually can wear out and does

There are 3 injectors on each bank of a V6 engine, one could leak and would only cause an issue(rich) on that bank, unlikely problem but you ask
 

Sponsored Ad


Sponsored Ad

Top