What could have caused such a drastic drop in mpg so suddenly?


Asked by May 27, 2014 at 10:03 AM about the 2003 Honda Civic DX

Question type: Maintenance & Repair

My 2003 Honda civic has always averaged 30mpg until I had a cam sensor replaced. Since the I get 19-20mpg. Mechanics checked every out and found no reason for the drop in gas mileage. It could be coincidental and separate issues but what the hell. Do I have to live with this huge drop?

4 Answers


who can live with it? gas is expensive- that does not seem to be a coincidence- you replace the sensor and you start gettin' the bad mileage- now- WHY did you have the cam sensor replaced? sounds like you are goin' backwards-

1 out of 1 people think this is helpful.

My car would stall out and it was determined that my cam sensor was the issue. My car no longer stalls outs and runs well but the mileage is abysmal. My mechanic insisted everything checks out and the cam sensor would have nothing to do with mileage anyway. They spent an hour going through everything and found everything up spec. They did not check the torgue?? something or other because they couldn't find a 'portal?' to it.

To replace this part the only point of contact to cause friction would be the timing belt plastic cover, find out if they pulled it back off and checked for improper scratch/rub marks. I would take it to another shop if you cant check it yourself - you will find a video on the University of YouTube


I will check that out Rex and let you know what happens. Thanks so much!

Your Answer

Add photo

Related Questions

  • 99 honda civic cranks won't start 10 answers

    Our 99 Honda Civic 4 door sedan (200,000 miles) just quit running while pulling out of a parking lot. Almost as if it had run out of gas (plenty of gas). There was NO warning of any kind that there...

    1999 Honda Civic LX


    Maintenance & Repair

  • 94 Honda Civic 1 answer

    While driving my 94 Honda Civic everything seems to be going well, but suddenly my Honda starts to jerk, slow down as if its chocking. I'll press on the gas but car wouldn't move pass 5mph. I'll le...

    1994 Honda Civic LX


    Maintenance & Repair

  • my honda civic cuts off when I give it gas, it idles and starts just fine but when i put it in gear and give it gas it cuts off 61 answers

    what is wrong with my 1992 civic it cuts off when I give it gas, it idles and starts just fine but when i put it in gear and give it gas it cuts off

    1992 Honda Civic LX


    Maintenance & Repair

  • 1999 Honda Civic Dies while driving 86 answers

    i have a 1999 honda civic ex which has 165,000 miles. Within the last few months the car will shutoff while driving. i have no power steering, nothing. i have to pull the car to side of the road an...

    1999 Honda Civic


    Maintenance & Repair

  • Engine suddenly shudders and puts out very low power 2 answers

    I have a 2001 Honda Civic Ex. When I'm driving in heavy traffic (stop and go) and it's very hot (I'm in Texas) occasionally my engine will shudder heavily and the most I can get from it is about 15...

    2001 Honda Civic EX


    Maintenance & Repair


Looking for a Used Civic in your area?

CarGurus has 58,106 nationwide Civic listings starting at $1,300.


Search Honda Civic Questions

Honda Civic Experts

#1 Takoda Fraser
Takoda Fraser
Reputation 930
#2 Jonathan Ford
Jonathan Ford
Reputation 890
#3 Tom Demyan
Tom Demyan
Reputation 820
View All

Related Models For Sale

Used Honda Accord"
1,272 Great Deals out of 77,636 listings starting at $1,395
Used Honda Civic Coupe"
335 Great Deals out of 16,293 listings starting at $799
Used Toyota Corolla"
1,435 Great Deals out of 66,812 listings starting at $1,295
Used Toyota Camry"
1,593 Great Deals out of 98,101 listings starting at $895
Used Honda CR-V"
1,535 Great Deals out of 80,325 listings starting at $1,695
Used Nissan Altima"
1,377 Great Deals out of 87,440 listings starting at $1,195
Used Mazda MAZDA3"
467 Great Deals out of 24,611 listings starting at $1,499
Used Honda Accord Coupe"
202 Great Deals out of 11,482 listings starting at $1,500
Used Hyundai Elantra"
848 Great Deals out of 51,287 listings starting at $1,995
Used Ford Focus"
1,170 Great Deals out of 56,883 listings starting at $1,495
Used Nissan Sentra"
869 Great Deals out of 49,508 listings starting at $500
Used Volkswagen Jetta"
625 Great Deals out of 32,204 listings starting at $1,200
Used BMW 3 Series"
1,632 Great Deals out of 39,404 listings starting at $888
Used Ford Mustang"
718 Great Deals out of 41,256 listings starting at $900

Used Cars For Sale

2017 Honda Civic For Sale
2,660 listings starting at $18,100
2016 Honda Civic For Sale
39 Great Deals out of 31,650 listings starting at $14,995
2015 Honda Civic For Sale
158 Great Deals out of 3,119 listings starting at $11,201
2014 Honda Civic For Sale
124 Great Deals out of 2,584 listings starting at $9,900
2013 Honda Civic For Sale
391 Great Deals out of 5,984 listings starting at $8,800