Question about 2003 Honda Civic

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Fuel consumption My car fuel consumption is too high 40 L take me 200 Km in the city >> I changed my spar plug and air filter >>

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  • Honda Master
  • 20,706 Answers

2003 civic (ill answer for engine, not dragging brakes, or seized wheel bearings etc)

GOT THE check engine lamp out, driving.? NO bad. scan it.

get it scanned yet to see if there are DTCs stored?

we scan regardless of any CEL status.



what id do, is get my own real scan tool for like $9 (ask)

and scan it.

then see if it holds Closed Loop status hot. if not?, fix that first.

if it holds CL at idle hot, then i check 40mph light flat cruise.

holds CL. (closed loop) if not IT WILL SUCK gas.



ever put a new cam belt on this engine. if not bending all the valves in the head is next. $1500 bill. or more.

never skip the cam belt.



i bet your engine is not working in CL, at all.

i discover that, and then work that problem , idle CL failure is the

most easy to work, its parked.

1: i check compression over 150PSI x4 and done at WOT, wide open throttle (pass or fail)

2: i check spark at all spark plugs , 03 timing is fixed.

3: now i check fueling,



i look at my live data from my scan tool and see that all senors read right but my front 02 sensors is rich all the time.

i check fuel pressure, its at spec,(35?psi) not 60 no 10, not 20

i do the injector leak down and balance test in the FSM.

it fails. i fix that.

it passes. i now put in a new front 02 sensor. bingo fixed.





Think of CL as MPG, NO CL , NO MPG

CL is is also called Stoich, and is the max ifficency point of the fuel air mix.

Posted on Jan 01, 2014

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Posted on Jan 02, 2017

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SOURCE: High fuel consumption

Check the following things: air filter, wheel alignment, and timing belt, all of them if not serviced on time can affect your fuel consumption. I do not think its the heat because I drive my car in Phoenix AZ with temperatures comparable to Dubai and I still get 500+ km/tank.

Good Luck,

Alex (Civic 2003 1.7 manual)

Posted on Sep 06, 2008

  • 14036 Answers

SOURCE: Very high fuel consumption on 2002 Honda Odyssey

transmission slipping dragging brakes.timing off worn timing belt .bad spark plugs + wires +coil.defected valves and worn cam shaft.use scanner to check oxygen sensor. run engine 5 minutes look at scanner . should read closed loop . if read open loop replace oxygen sensor.

Posted on Apr 03, 2009

motor1258
  • 6674 Answers

SOURCE: High fuel consumption , even after changin plugs/filter/Eng.oil/cvt gear oil and cleaning the throtle

Checked brakes for possible wheel(s) dragging, as well as tire pressures up to max recommended pressure, and observe if tire wear unusual, signifying improper alignment? Any difference in engine oil grade used?

Posted on May 13, 2009

  • 1 Answer

SOURCE: My 1986 Honda Accord fuel consumption is high.

sell it

Posted on Mar 11, 2010

dreilly41
  • 65 Answers

SOURCE: My car Honda City done

Oil Change, Air Filter replacement, coolant check, tranny filter change, rotate tires and check pressures, and cabin air filter are among the more important ones to consider along with having the brakes and rotors checked and machined if required.

Posted on Mar 14, 2011

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That is a very low consumption figure, are you sure you don't have a leak in the fuel system?

Of course it depends on the vehicle, engine size etc and the driving conditions eg city or high speed driving and weight being carried.

You should have had the ignition system i.e plugs, injectors and air filters checked over. An over rich mixture can drastically reduce fuel consumption.




Please remember to rate this soltion.

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A Honda Accord is a full size car/heavy and therefore would have high gas consumption, probably around 8~10 Km/L city driving. Highway would roughly be 10~12 depending on your driving habits.

A full tune-up of course would help which may include but not be limited to change of sparkplugs, adding car/injector cleaner to the tank, checking/replacing the air cleaner, double checking/cleaning/replacing the MAF (if it has got one).

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

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1 Answer

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Check the following things: air filter, wheel alignment, and timing belt, all of them if not serviced on time can affect your fuel consumption. I do not think its the heat because I drive my car in Phoenix AZ with temperatures comparable to Dubai and I still get 500+ km/tank.

Good Luck,

Alex (Civic 2003 1.7 manual)

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