Lack Of ho2s-21?? Lean Mixture Help - Mustang Evolution

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Old 02-14-2011, 06:00 AM   #1
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Lack Of ho2s-21?? Lean Mixture Help

I need help with this check engine light:
SCT scanner pulls up the following:
lack of ho2s-21 Switches-Sensor indicates lean (bs,s1)
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Old 02-14-2011, 08:48 AM   #2
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Re: Lack Of ho2s-21?? Lean Mixture Help

For a minute I thought you said: "lack of hoes"
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Old 02-14-2011, 08:51 AM   #3
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Re: Lack Of ho2s-21?? Lean Mixture Help

Are your Oxygen Sensor's Missing?

I imagine you mean (b1,s1) That sensor may need replacement. It could also be an electrical issue, trace the wiring and inspect for damage. Lastly PCM's not operating can effect these codes.
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Old 02-14-2011, 09:53 PM   #4
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Re: Lack Of ho2s-21?? Lean Mixture Help

Quote:
Originally Posted by SaleenFiend View Post
For a minute I thought you said: "lack of hoes"
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Old 02-15-2011, 12:12 AM   #5
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Re: Lack Of ho2s-21?? Lean Mixture Help

Quote:
Originally Posted by SaleenFiend View Post
For a minute I thought you said: "lack of hoes"
That's a pretty serious code to have. I'd take it somewhere immediately.
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Old 02-15-2011, 05:05 AM   #6
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Re: Lack Of ho2s-21?? Lean Mixture Help

OK, thanks. Which section of wiring should I inspect? The investigating I did on line provided a dozen or more possibilities. I do have a broken oil dip stick, that was a possibility. Any chance that a electrical connector has come apart? Coincidence or not, I got the check engine light coming home from the shop after having hands all over the car when installing gears, flywheel, clutch ect..
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Old 02-15-2011, 05:19 AM   #7
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Re: Lack Of ho2s-21?? Lean Mixture Help

Quote:
Originally Posted by SaleenFiend View Post
Are your Oxygen Sensor's Missing?

I imagine you mean (b1,s1) That sensor may need replacement. It could also be an electrical issue, trace the wiring and inspect for damage. Lastly PCM's not operating can effect these codes.
Thanks, No- my o2 sensors are still on there. I will follow your advice and trace the wires out. I will try switching SCT files over to the 93 octane tune although I believe that was what I was running when it popped up.
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Old 02-15-2011, 08:58 AM   #8
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Re: Lack Of ho2s-21?? Lean Mixture Help

What Mods do you have. Basically check the wiring for the Oxygen Sensors from the Sensor back up towards the harness. Check for any damage to the insulation or anything. Once you get to the harness it's really not much you can do as it's in the transmission tunnel and has wire loom installed. Check your connectors. I'm not real tech savy on electrical but you should also see if your getting power to the sensors in the wiring. Most of the time if your haveing Oxygen sensor issues it is usually related to a ECU/PCM problem. I would definettely have your tuner double check his tune and I would try a factory tune if your not modded beyond being able to run a stock tune. Do you have an offroad midpipe?
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