Catalyst converter issue

[ER-3682]

Anyway this @Johnwalktreated us like Idiots,started a new Thread in the middle of the Night & now MIA.....We ''Gong Gong'' give advices,He never even tell anymore Details.

[mersaylee]

On 7/11/2025 at 7:05 PM, ER-3682 said:

Anyway this @Johnwalktreated us like Idiots,started a new Thread in the middle of the Night & now MIA.....We ''Gong Gong'' give advices,He never even tell anymore Details.

Give benefit lah...maybe busy googling for remedies...i also liked that lust time...googled late into the night until the one laying next to me thot i was texting a little tree...😂

[Ct3833]

On 7/11/2025 at 2:40 PM, kobayashiGT said:

If left less than 3 years, Just go scrap yard and find a replacement. No need get new lah. 

tong yi tong, can change new car liao. 

if TS take loan, he cannot just off load the car, sure lose money. 

 

On 7/11/2025 at 1:24 PM, ER-3682 said:

Could be a 10 Years COE Masarati.

 

On 7/11/2025 at 1:12 PM, ER-3682 said:

TS missing liao.

If I am TS, after reading some of the posts, I will go missing too😃

[FrankieLoh]

Bring workshop to remove CAT for deep cleaning if after using additive cleaner doesnt work

[mersaylee]

On 7/12/2025 at 11:15 AM, FrankieLoh said:

Bring workshop to remove CAT for deep cleaning if after using additive cleaner doesnt work

Know any shops here still do snowfoam cleaning of cat?

I suspect most shops nowadays clean only the sensor and then say it's a bad sensor or need to replace either it or the cat...easier job and can earn more...😅

[FrankieLoh]

On 7/12/2025 at 11:31 AM, mersaylee said:

Know any shops here still do snowfoam cleaning of cat?

I suspect most shops nowadays clean only the sensor and then say it's a bad sensor or need to replace either it or the cat...easier job and can earn more...😅

Not foamcleaning....its using machine and pressure to clear out your CAT.

Ever cleaned mine at GOODFELLAS AUTO located at Soon Lee Pioneer area.

[mersaylee]

On 7/12/2025 at 12:10 PM, FrankieLoh said:

Not foamcleaning....its using machine and pressure to clear out your CAT.

Ever cleaned mine at GOODFELLAS AUTO located at Soon Lee Pioneer area.

Hope they serve this also while i wait...🙏😁

https://www.goodfellowscoffee.com/

[Ct3833]

On 7/12/2025 at 12:10 PM, FrankieLoh said:

Not foamcleaning....its using machine and pressure to clear out your CAT.

Ever cleaned mine at GOODFELLAS AUTO located at Soon Lee Pioneer area.

Wah new to me, didnt knos cat can be cleaned, what would be the waste coming out of the cat ? Insuppose they have proper disposal process?

How to know a cat needs to be clean ? My dumb old altis got no warning nothing.

[Gnahp]

On 7/13/2025 at 12:40 PM, Ct3833 said:

Wah new to me, didnt knos cat can be cleaned, what would be the waste coming out of the cat ? Insuppose they have proper disposal process?

How to know a cat needs to be clean ? My dumb old altis got no warning nothing.

provided the cat is not dead

if the error code is caused by heavy sooting, cleaning will restore its functionality

if the cat is dead, a cleaned dead cat is still a dead cat

 

last time my Getz's cat dead at around 250,000km

I just kept clearing the code until I traded it in for another car, engine ran smoothly, no funny smell no change in fuel consumption too

W204 traded in at 280,000km, cat sui sui, no trouble

 

Edited July 13, 2025 by Gnahp

[FrankieLoh]

 

No bad smell No lost of FC No lost of Power? Probably is just sensor faulty problem. CAT has 2 sensors, one located at upstream and one downstream.

 

 

On 7/13/2025 at 2:27 PM, Gnahp said:

provided the cat is not dead

if the error code is caused by heavy sooting, cleaning will restore its functionality

if the cat is dead, a cleaned dead cat is still a dead cat

 

last time my Getz's cat dead at around 250,000km

I just kept clearing the code until I traded it in for another car, engine ran smoothly, no funny smell no change in fuel consumption too

W204 traded in at 280,000km, cat sui sui, no trouble

 

 

[Yeobh]

One of the way to clean carbon deposits inside the cat  is to spray cleaning detergent directly on to the cat filter / element via the sensor opening. The process will have to be don a few times to break down  the carbon . Removing the carbon is by running the engine / cat very hot and blow the carbon out by high acceleration. 

[Johnwalk]

Sorry busy with work. It's attrage left one year. I just continue drive.

The engine light will appear and went off and sometimes on again.

[mersaylee]

On 7/26/2025 at 9:04 PM, Johnwalk said:

Sorry busy with work. It's attrage left one year. I just continue drive.

The engine light will appear and went off and sometimes on again.

Just drive on till scrap if no more inspection to be done...attrage not much body value or resale value to begin with anyway...

[myear]

If it’s only 3 days after buying, I’d push the dealer to sort it out since that’s not normal wear and tear. Bypassing the cat won’t pass inspection, you’ll just run into more trouble later.

 

Tutuapp  

Edited October 31, 2025 by myear

[Ct3833]

On 11/1/2025 at 12:29 AM, myear said:

If it’s only 3 days after buying, I’d push the dealer to sort it out since that’s not normal wear and tear. Bypassing the cat won’t pass inspection, you’ll just run into more trouble later.

 

Tutuapp  

Now no more 3 days liao, dealer will likely wash hand as usual. From Jul to now, his car should have less than 10 months to go, either he drive on if without lossing power, or maybe can find one from scrap yard. 

Dont know how long this thing can last, my 16yo cars so far no problem,  pray ! 

[Repulsive_War_018]

On 7/10/2025 at 11:21 AM, Johnwalk said:

Just bought a 2nd hand car and after 3days engine light light up. Went back to dealer and he ask me to drive to below workshop and check is catalyst error code.

He doesn't want to fix for me saying it is wear and tear part. What should I do?

If bypass it, will it pass inspection?

Sorry to hear about the issue. A failing cat can be caused by a few things, like a faulty oxygen sensor, old spark plugs, or even an underlying engine problem causing it to run rich.

Before replacing the expensive catalytic converter itself, it's crucial to have a shop diagnose the root cause. Otherwise, a new cat could fail again quickly.

Good luck! Hope you get it sorted.