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Old 07-03-2021, 09:12 AM   #1930
calgarygeologist
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Quote:
Originally Posted by 81MC View Post
An exhaust leak can make the o2 sensor read leaner than it actually is, which wouldn’t typically throw a code. But you’d probably hear something.

What’s more probably, and harder to diagnose, is just an o2 sensor going bad. Assuming it’s mechanically sound otherwise, o2 sensors can start to go bad without throwing a code. Typically this will have that negative fuel economy impact you’re seeing. But you’d have to do some serious comparisons and see what’s more economical - throwing sensors in it vs. the realized fuel economy loss.
I can try putting two new O2 sensors into the manifolds to see if that helps at all. It looks like I can get sensors for $40 each and swapping them out is relatively easy.

Quote:
Originally Posted by GGG View Post
Was it really windy?

I always find I get worse mileage driving down 22 with a strong crosswind. So if it was just this trip it could just be that.
It wasn't windy at all. Definitely not windy enough to notice any impact on the vehicle being pushed around from gusts.

The only difference that might have impacted aero and fuel economy this trip is that I had a 4 bike platform carrier on the hitch with our mountain bikes. Maybe that created enough drag to drop fuel economy about 20%?
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