We have a 2011 Honda CR-V SE (AWD) that I was getting roughly 22mpg in city and up to 30mpg on highway until late last year. The car only has 57k miles and is in good shape, used mostly for short trips and limited mileage (have put only about 6k miles in 3 years since we bought it.)
At the end of last year, I had to get a new catalytic converter based on a check engine light. This was covered under EPA warranty by Honda Service.
Shortly after, I also had to replace my tires in order to pass the NY state inspection.
Since then, our mpg has dropped by about 50%. We get close to 12mpg in the city and about 20mpg on the highway.
I’ve taken it to Honda and they’ve said that this shouldn’t be the catalytic converter and the car is just getting old… Which is not a helpful response because clearly something is different The tires also have been inflated properly and the temperature change in NY hasn’t made any noticeable difference.
I’ve also seen from my Torque app and OBD scanner that there are some “incompletes” under Catalytic and O2, which leads me to believe there might be an issue with the emissions systems. (see attached pictures). We did have difficulty performing the drive cycle so that the new cat would pass the state test (had to drive 300+ miles).
Now this is starting to cost us a lot more for gas than we would like… It’ll probably be cheaper to just pay for the repairs, but we arent sure where to start as there are no codes and the car is otherwise running fine.
I was hoping the smart people of this forum may have some ideas to help us narrow it down before we have an expensive trial and error.
Some ideas from speaking to mechanics and doing research
- Bad Catalytic converter or installation: an independent mechanic said it is possible that Honda used a bad part or did a shotty job because it was covered by the EPA warranty and that they could get me to come back and pay more. Don’t know about the conspiracy theory, but obviously around that time it stopped working.
- O2 sensors: they did not replace these when changing the catalytic converter as far as I know. I’ve read that they should be swapped at the same time.
- Spark plugs: mechanic mentioned this could be an issue, but also doesn’t seem like this should have that level of impact on mpg
- Air filter: same as spark plugs
- Wheel alignment: when we put new tires on, we did not have the wheels aligned. Probably should get this done soon but I don’t think this would cut Mpgs in half?
- Drive cycle: the Honda service shop wasn’t able to so the recommended step by step drive cycle. Eventually after enough miles, the cat was operational and I passed the state test.
Thanks in advance. I appreciate any ideas or guidance you have here.
Here are the pics from Torque: