mine was p0420 error

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

https://my.shp.ee/7zEyhrb getsun

my actual cause was tangan gatal. spray 3bond cleaner into throttle body & intake manifold there.
i guess all dirt went behind stuck

Now that quite some time has passed, mind sharing if o2 sensor change indeed fixed the FC issue ?

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.

For oxygen sensor, how many km do we need to change it? Cuz my old camry acv30 year 2003 already clocked 411 000km plus, the fuel consumption very good

scan with obd reader first

Okey, will scan it first, thank you

o2 value changing according to u pijak pedal.
means ok. want value range (in depth), need google him out

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

Okey, at least if engine light pop up i dont panic as it is indicator of the oxygen sensor, if so i will scan it first to detect the main issue, surprisingly my acv30 2.0e camry fc still good so nothing to worry about at the moment, but always be ready 😏🔥

P0421 is o2 sensor related?

chatgpt said yes related to O2 sensor

Washed sensor, reset error. Wait and see