Recently I had brought my car into the shop because I got a maintenance required soon warning up, along with the check engine light. The technician cleared the lights, then took it for a drive - the lights did not come back, and they could find not problems. But now I am getting lower gas mileage. The dashboard eco drive is between 30 - 35, where it used to be over 40. Any reasons you can think of? The technicians are saying they don't know, only 46k miles on this car.
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Answer #1mastertech6371 January 30, 2012, 22:14Master
first of all, clearing the codes was wrong. the code is a guide to the system that has an issue.
you need another shop that will do a proper diag and give you a reason for the poor mileage.
Replyrjc1972, January 30, 2012, 22:24Rookie
so when they cleared the lights, then took it out for a test drive to see if the lights came back on, that was wrong? The lights did not come back on - the tech said that sometimes the computer system gets a "glitch"?
So, wouldn't the lights come back on if there was something wrong with the car?
Replymastertech6371, January 31, 2012, 10:28Master
some codes do not set right away and take 3 trip failures to set. it will come back on at some time. then you need the code pulled, diaged to find the reason and repaired.
clearing the code erases all the vital info needed to trace the proble. clearing the code is the very last step in the repair procedure. a good shop would know that.
Answer #2patrick mannion from Greg Solow's Engine Room, January 30, 2012, 23:11Master
Roy is right, you should not clear codes until the fault is fixed. What was the designation of the code stored? It should start P0xxx, or P1xxx.You first read the code, read the freeze frame information that was taken when your car's computer first saw the code you can then look at live sensor data to see if anything is amiss, then even look at pending codes or Mode 6 information to get an idea of the whole picture not just erase the code and hope it doesn't come back.
If you otherwise like your garage and they are stumped, There is a professional service called Identafix. http://www.identifix.com/info/about_us.htm They only deal with professional repair shops. They are in the Minnesota 651-633-8007 begin_of_the_skype_highlighting 651-633-8007 end_of_the_skype_highlighting. Your auto repair shop do all their diagnosis tests, and discuss your problem with a team of professional technicians great service cheap and very bright people. If the repair shop that are repairing your car are stumped this is a great service. This company only deal with automotive repair shops and don't answer questions for the general public but are an amazing knowledge base.
They are based near you, your repair shop will really like Identafix.
Replyrjc1972, January 31, 2012, 14:13Rookie
Ok, this is update 2/9/12 - These are the codes on my receipt that they found and cleared: P0A0F, P0102, P3190
they cleared these, and they didn't pop back up, they attribute to a "glitch"
Car is in shop again to have the parts installed for steering wheel recall - they still say they cannot find anything as to why I'm now getting poor gas mileage. I have not been getting the "Eco drive excellent" in the instrument panel like I normally do, and it's saying that my mileage is around 30, whereas I was getting 40 or better. I asked if they had called for assistance on this, they said they did, any suggestions?