Since repacing both gas mileage from 33 mpg to 27. Brought it back to repair shop tjey said the could not find anything wrong
Toyota Q&AAsk Your Question
2007 Toyota Corolla Question: My 2007 toyota had a battery and serpentine belt replacement now low gas mileage
Answer #1pushrod February 04, 2014, 06:14Master
This is just a coincidence, your mpg would not have been affected by those parts being replaced! If they had knocked something loose, the check engine light would be on! Look elsewhere for a the loss of mpg, recheck it to start with while driving your routine daily travlels.
Replygraciejames, February 04, 2014, 07:32Rookie
This has been going on for 3 weeks now starting with the first gas fill after the r\preventative repairs. Nothing else has changed. I have been reading about the ECU needing to be reset after replacing battery
Replypushrod, February 04, 2014, 07:46Master
No that's not true! The computer/ecu would have relearned those strategies before you got home!!!★ Also most professionals or repair shops use a power saver when battery is disconnected so that will not happen!! Recheck your mpg just to be sure.
Replygraciejames, February 04, 2014, 08:47Rookie
thanks for your help but just filled up again yesterday...27 mpg...before battery replacement average 33...no good answer yet:)
Replypushrod, February 04, 2014, 10:02Master
Hope you get one! However there may not be one!!
Answer #2Greg's Orange Auto (13211 Answers) , Orange, CA - (714) 361-9386globalhelper February 04, 2014, 06:37Master
poss they reset computer when repl battery,fuel trim will take over and may repair itself
Replygraciejames, February 04, 2014, 07:33Rookie
I hope so tho this has been going on for 3 weeks now since battery and serpentine belt replaced. thx