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0xygen sensor and Air Box

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Old Feb 18, 2013 | 07:21 PM
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Sam1977
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0xygen sensor and Air Box
Just recently installed a Carbonio Air Box (+filters it comes with) and all was good for a few weeks.

Now all of a sudden I'm getting the Engine light come on. Took it to dealer yesterday who reset the error (which was Oxygen sensor bank 1 has electrical fault)

Would this have anything to do with the Airbox, i.e. too much air messing with fuel/oxygen level and throwing off the error)

Also had a tune pre installing air box, dont know if l have to retune?

Thanks in advance
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Old Feb 18, 2013 | 09:06 PM
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Oxygen sensors are in the exhaust. They don't last forever.
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Old Feb 18, 2013 | 09:08 PM
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car only has 28,000Km's on it

Yep know they are in the exhaust and thought they measured the air/fuel mixture being pumped out the back for pollution purposes
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Old Feb 18, 2013 | 10:52 PM
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Originally Posted by Sam1977
car only has 28,000Km's on it

Yep know they are in the exhaust and thought they measured the air/fuel mixture being pumped out the back for pollution purposes
oxygen sensors sense oxygen, FYI.
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Old Feb 19, 2013 | 01:07 AM
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Yep ^^ they measure oxygen levels in the exhaust. No oxygen = stoichiometric.

Monitoring the cats is the function of the secondary O2s.

The primary O2s control the AFR via closed loop feed back.
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Old Feb 19, 2013 | 01:12 AM
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so if i take it to Mercedes they shouldn't turn around and say it's b/c of the air box/filter addition?
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Old Feb 19, 2013 | 01:15 AM
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Dealer will always blame after market parts. Lots of the techs are useless, the odd one will actually try to fix it.
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Old Feb 19, 2013 | 03:03 AM
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It's booked, lets see how we go
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Old Feb 19, 2013 | 03:07 AM
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Jack your car up and switch the secondary O2s (after the cats) to the opposite sides. If the code switches sides, get a new sensor.

Unless you have warranty, then dealer u go.
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Old Feb 19, 2013 | 03:09 AM
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Exact same advice I got from my tuner
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Old Feb 19, 2013 | 03:14 AM
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Youre tuner is a smart man
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