Why the drop in gas mileage and occasional awkward shifting?

5

Asked by Jan 12, 2017 at 04:31 PM about the 2006 Honda CR-V EX AWD

Question type: Maintenance & Repair

Bout a month ago, my mom's 2006 Honda CRV randomly shifted
awkwardly from reverse to drive (or drive to reverse, whichever) and the
car shut off. It started up fine except now it sounds slightly louder than
normal and her typical 23 miles per gallon is an atrocious 15 mpg. She
changed the typical things like air filter, spark plugs and added fuel injector.
There was only a total 8 mile increase for the entire tank, which is nothing.
No mechanic has been able to diagnose an issue because the check
engine light is not on. They all say it sounds and runs fine, therefore have
no reasoning for the drop in mpg. But there has to be, tire pressure is
normal and driving habits have not changed. What could cause mileage to
drop this much? Is it fixable?

2 Answers

119,735

The only thing I can think of would be catalytic converter being clogged and oxygen sensor not operating correctly. You dont say how many miles on the car, I would assume snice the car is 15 years old that it would be well over a 100,000 miles...

5

It actually does not have that many miles, around 90k or so. And if the oxygen sensor were not operating correctly I'd guess it would set off the engine light, no? Unless it's possible for it to malfunction and not have the light go off?

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