New mass o2 sensor

New mass o2 sensor

Postby Pengyou [OP] » November 8th 2015, 9:16pm

I installed a new mass O2 sensor - see photo. I think I installed it correctly. Now my gas mileage has dropped to 8 mpg from 14. My first thoughts - I installed it in correctly; the new part is bad; or there is something else spontaneously wrong with the van. Any ideas?
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Re: New mass o2 sensor

Postby Corsemoto » November 9th 2015, 2:30am

Sounds like it could be a bad MAF with the poor fuel economy after replacing. What brand? Check the connector and be sure to disconnect battery when replacing.
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Re: New mass o2 sensor

Postby AstroWill » November 9th 2015, 2:37am

IF that is the only thing you changed, I would put the old one back in. Could be bad sensor, bad calculations, bad connections...etc.

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Re: New mass o2 sensor

Postby Pengyou [OP] » November 11th 2015, 10:45pm

Yes this tank i got 15 mpg.
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Re: New mass o2 sensor

Postby Corsemoto » November 11th 2015, 11:39pm

May be worth disconnecting battery for 30+ minutes to allow relearn on some functions.
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Re: New mass o2 sensor

Postby kennysmoke » November 11th 2015, 11:41pm

I had a bad MAF sensor which caused my mileage to go way down which in turn caused my CAT to plug... it never threw a code until the morning I was going to get the CAT changed. Replaced both and mileage is back to an average of 15 MPG...
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Re: New mass o2 sensor

Postby Corsemoto » November 12th 2015, 4:33pm

Similar happened to my van with bad MAF plugging catalytic converter on a road trip.
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Re: New mass o2 sensor

Postby AstroWill » November 13th 2015, 8:40am

All that extra fuel takes it's toll on your wallet and the cat, that is for sure, and if it's continued it will take it's toll on other things as well.

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