my car already hit 11th years old now, clogged 245k km. Summary never had any issues because I did take care of maintenance. However, once heading 170k km onwards, this car's fuel consumption worsens vs. b4 that mileage. especially the city drive. Noted the white smoke on early morning drive b4 car hit optimum temperature.

Things had been done, normal EO change with retaining the manufacturer's viscosity, 0w20, throttle body cleaning, fuel filter change at SC, Iridium spark plug (change per 100k km interval same as manual), few times fuel additive in bottles with varios brands as well as catalytic converter cleaners in bottle form (put it in fuel tank). However, the FC remains as it is. Thus, changing the O2 sensor (my car had 2) will restore the FC? No engine light pops up atm.

i done this in the first place cz just needed to unscrew 2 sides. Then I spray it with contact cleaner spray. chatgpt suggest me to change the O2 sensor cz of mileage, max 150k km need to change.

just purchased the O2 sensor for my car online, original, need 2, one at the front and another for the rear. google around, also ask to change after some interval, around 150k km max.
then watch youtube also shown the details, need to change O2 if FC getting worse Youtube

This post has been edited by ayamxxx: Apr 30 2025, 02:46 PM

its a 2014/15 Accord 2.4, T2A. I proceed with the O2 sensor purchase and will install later once receive it.

there are 2 sets of O2 sensors for my car, the no 1 is easy cz just beside the engine. I already had the sockets to open the O2 sensor, so now waiting for the delivery of it. The No. 2 is behind or below the engine, might as well send it to a nearby workshop for installation.

SC, not just at much2 premium price, but needs to order and takes 2 weeks for delivery. This for my nearby Honda SC

I ask around for Catalytic converter clean service physically, all quoted rm700-850 for my car. So bought the liquid form and put it on fuel tank, not sure if it effective. Mr Diy also had that nowadays in a bottle form

Diy black bottle, which one ya. Usually bought Aeropak Throttle body cleaner, saw their Catalytic converter cleaners, quite affordable and 300ml quite generous

In the US, based on YouTube, they all got great feedback after use CataClean bottles. After all, they got annually car inspection, based on certain states, and this CataClean work the effect. Just here, it priced at above rm150 in average and more pricier if Diesel engine

yup in my case, able to return the FC as new back. from bad reading of 8.8km/l (combined city + highway) to now 13.3km/l with similar drive.

Two stages, if O2 sensor already not functioning, engine light will pop up intermittently or heading bad, permanently. This happened to my office pickup car, Triton with 300+k km, and SC Mitsubishi just put reset via reader, but the issues will return back. Until office guy send outside workshop and put new sensor, no more engine light pop.

On my car, since use it since new, kinda knows on what the FC average I get per refuel, and when passing 200k km, the FC kinda went worst. Done the normal EO change, atf oil, fuel filter, spark plugs but FC remain the same and not as new. Until change this O2 (my car had 2 of it), the FC restore back. Surprisingly able to hit 17km/l from JB - Kajang on meter, but at 110-120kmh consistent drive, quite tiring

This post has been edited by ayamxxx: Oct 21 2025, 06:45 PM

chatgpt said yes related to O2 sensor