beeoohtee:

Hi Auto professionals.

I must commend the good work being done on this platform. You have saved most of us from unnecessary auto headaches caused by unqualified technicians

I recently bought a 2006 honda civic America spec. The fuel economy isn't encouraging at all.
Approximately 14 MPG is what I get for city drive While 17 MPG for highway drive with AC turned on.

I know for sure that a healthy Honda civic has a better fuel economy but I am in dilemma with the poor fuel economy I am getting with mine.

The following troubleshooting has been done.
1. The exhaust has been checked for leaks but no leak detected.
2. 02 sensors tested ok
3. MAF sensor tested ok
4. Ignition coils tested ok
5. Spark plugs tested but can't ascertain if they are working properly.
The spark plug resistance is about 4000 ohm using a multimeter as against the 5000-6000 ohms for OEM brands


However, I had a P0118 and U0155 codes when the vehicle was scanned. Despite having the cold switch sensor changed the code still persist.

Attached are the scanned results below

These are the noticeable symptoms

**The vehicle occasionally stalls before starting in the morning and during the day when the engine is hot.

**Lately I noticed the battery light is turned on for a short while and D green light blinks when I drive through pond of stagnant water/Rainfall runoff water. Power steering is hard within the short encounter. After few moments normalcy returns.

Moving forward...
1. What else can be done to solve the cold switch sensor problem?
2. What can be done to improve the poor fuel consumption?
3. For 8th generation (2006-2010) Honda civic users. Please what is the average fuel economy (MPG) you attain from your respective vehicles?
4. How can the U0155 code related problem be fixed?

I am tired of this try and error Approach.
Please Auto gurus, Kindly assist me your professional contributions and guidance.


Cc: Luvinhubby
Gazzuzz
Ikenna351

GAZZUZZ:


Trace the temp circuit connections from source to ECU.

If it is fine, replace the Engine ecu.

Elxandre:
How did you measure the mpg sir?

beeoohtee:


The measure of fuel economy is quite easy. You can measure as MPG (Miles per gallon) or KMPL (Kilometer per litre).

Pay attention to your instrumental cluster. Some cars speedometer are calibrated in Mile, Kilometer or the combination of both. The bolder speed indicator is the speed unit designed for the car.

Two key parameters are required.
1. Quantity of fuel used in Litre/gallon
2. The distance covered with respect to the quantity of fuel purchased.

For instance.
I covered 75km with 2k fuel equivalent to 12 Litres
1km = 0.62miles
1 litre = 0.26gallon

KMPL/MPG = 75km/12litres = 6.25KMPL = 14.7MPG

Treadway:
op, the Ect sensor you changed, i'm guessing it is the one visible at the top close to the engine. That is the wrong one. The car has two, there is one at the bottom of the radiator, get that one replaced and you're home free, your engine will start just fine at cold start and your fuel economy will improve. From a honda civic user who also changed the top one thrice but the code kept returning before i eventually discovered the car had another attached to the radiator base. Cheers

beeoohtee:
Hi Auto professionals.

I must commend the good work being done on this platform. You have saved most of us from unnecessary auto headaches caused by unqualified technicians

I recently bought a 2006 honda civic America spec. The fuel economy isn't encouraging at all.
Approximately 14 MPG is what I get for city drive While 17 MPG for highway drive with AC turned on.

I know for sure that a healthy Honda civic has a better fuel economy but I am in dilemma with the poor fuel economy I am getting with mine.

The following troubleshooting has been done.
1. The exhaust has been checked for leaks but no leak detected.
2. 02 sensors tested ok
3. MAF sensor tested ok
4. Ignition coils tested ok
5. Spark plugs tested but can't ascertain if they are working properly.
The spark plug resistance is about 4000 ohm using a multimeter as against the 5000-6000 ohms for OEM brands


However, I had a P0118 and U0155 codes when the vehicle was scanned. Despite having the cold switch sensor changed the code still persist.

Attached are the scanned results below

These are the noticeable symptoms

**The vehicle occasionally stalls before starting in the morning and during the day when the engine is hot.

**Lately I noticed the battery light is turned on for a short while and D green light blinks when I drive through pond of stagnant water/Rainfall runoff water. Power steering is hard within the short encounter. After few moments normalcy returns.

Moving forward...
1. What else can be done to solve the cold switch sensor problem?
2. What can be done to improve the poor fuel consumption?
3. For 8th generation (2006-2010) Honda civic users. Please what is the average fuel economy (MPG) you attain from your respective vehicles?
4. How can the U0155 code related problem be fixed?

I am tired of this try and error Approach.
Please Auto gurus, Kindly assist me your professional contributions and guidance.


Cc: Luvinhubby
Gazzuzz
Ikenna351

Treadway:
mpg? like 7-8 litres will do like120km easy highway, not stop and go driving tho,

You get 15kmpl on your car for highway way drive with AC? That's like 35mpg

Boss what car do you drive?

beeoohtee:


You get 15kmpl on your car for highway way drive with AC? That's like 35mpg

Boss what car do you drive?

beeoohtee:


The measure of fuel economy is quite easy. You can measure as MPG (Miles per gallon) or KMPL (Kilometer per litre).

Pay attention to your instrumental cluster. Some cars speedometer are calibrated in Mile, Kilometer or the combination of both. The bolder speed indicator is the speed unit designed for the car.

Two key parameters are required.
1. Quantity of fuel used in Litre/gallon
2. The distance covered with respect to the quantity of fuel purchased.

For instance.
I covered 75km with 2k fuel equivalent to 12 Litres
1km = 0.62miles
1 litre = 0.26gallon

KMPL/MPG = 75km/12litres = 6.25KMPL = 14.7MPG

Peppermintflav:

Your calculation is wrong. 75km/12litres will give you 17.66mpg

beeoohtee:
I stand to be corrected... But how did you get your 17.66mpg?

Peppermintflav:

Your calculation is wrong. 75km/12litres will give you 17.66mpg

beeoohtee:
I stand to be corrected... But how did you get your 17.66mpg?

aieromon:


You are referring to the UK MPG which uses a different ratio from the US gallon.

Peppermintflav:

https://www.care4air.org/doing-your-bit/how-to-calculate-your-fuel-consumption/

GAZZUZZ:


Trace the temp circuit connections from source to ECU.

If it is fine, replace the Engine ecu.

beeoohtee:
I knew you were referring to a different conversion ratio. I wanted you to land your point before clarification.
Be informed that US gallon conversion to Litres is different from UK gallon to Litres (otherwise known as Imperial gallon).

@aieromon contribution is absolutely valid 100%


Warm regards

emerich:
You guys don't need to work your head anymore for calculations. Just input the Km and and the litres used and it would generate all the values needed
https://www.matthewb.id.au/converter/fuel-efficiency-converter.html

Treadway:
op, the Ect sensor you changed, i'm guessing it is the one visible at the top close to the engine. That is the wrong one. The car has two, there is one at the bottom of the radiator, get that one replaced and you're home free, your engine will start just fine at cold start and your fuel economy will improve. From a honda civic user who also changed the top one thrice but the code kept returning before i eventually discovered the car had another attached to the radiator base. Cheers

Ps: shey na from me you buy Autel MS309 ni..lol. I sell/distribute the product, including to buyers from here on nland. If it was bought/sent from Ibadan, then na me. OK bye

beeoohtee:
I wanna appreciate everyone for their contributions
The fuel economy has improved slightly by 20%.
Highway drive fuel economy with AC is now estimated as 21MPG

Maintenance Update
1. ECT radiator sensor has been replaced
2. Thermostat has been installed.

Treadway:
glad to be able to help. It will get even better, esp with the ECT cold start issue out of the way. What engine oil do you use?

Treadway:
glad to be able to help. It will get even better, esp with the ECT cold start issue out of the way. What engine oil do you use?

beeoohtee:

I use Hardex oil 5W 30

Treadway:
glad to be able to help. It will get even better, esp with the ECT cold start issue out of the way. What engine oil do you use?

Secondly, that evap leak code isn't solely a fuel cap issue. Check to make sure airflow meter is still working well. Also look at the rubber and hoses rom the air filter for cracks. Na either of these two, or both. What I would do is just buy one airflow meter, it's not expensive and replace, then rescan.

Treadway:
no no no. Hardex is a no no. Pls switch to Mobil 5w30 if you can't afford synthetic 5w20. The Mobil with the black cap. That hardex even the original isn't highly rated, now further compounded by the fact that the fakes are everywhere

beeoohtee:

MAF sensor is perfectly working based on my diagnostic. The air filter and hoses are void of cracks

beeoohtee:


BTW...
The scan code P0455 was detected recently. Attached herewith is the code illustration.
I have replaced the fuel tank cap but the code still persist.

Please AUTO GURUS, what can be done to fix the error code on my 2006 honda civic?

aieromon:


Do you top up fuel until it starts pouring out from the pump nozzle?

Clear code and see if it returns.