u/Remarkable-Wrap7195

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Hi, I have a 1999 Toyota Celica T23 1ZZ-FE (pre-facelift), and I replaced the catalytic converter with a new one. Before replacing it, the car had very poor power and the check engine light was on with error code P0420 (catalyst system efficiency below threshold). The catalyst core was loose and had been held in place with two screws. I also installed a spacer on the second O2 sensor to prevent the error from coming back, but the car still had no power.

Now, after installing the new catalytic converter, the car still doesn’t pull properly and feels sluggish. On cold start, it revs up very, very slowly until around 3000 RPM. After driving it hard for a bit, it feels slightly better than before, but not by much. What could be causing this?

The old catalytic converter was completely empty inside — the core had melted down, and in my opinion it smelled like burnt oil. Now it no longer smells. The car has 253k km, does not consume oil, and does not smoke, and it didn’t smoke before either.

Thanks in advance!

Salut, am o Toyota Celica t23 1zz NFL din 99 și i am schimbat catalizatorul cu unul nou, mașina înainte cu cel vechi nu trăgea și avea check engine aprins (p0420) eficienta la catalizor scăzuta, miezul era desprins și a fost prins cu 2 surube i am montat un distanțier la sonda lambda 2 sa nu mai de a eroare și mașina tot nu trăgea iar acum după ce l am pus cel nou mașina tot nu trage și merge greu. La prima pornire se tura foarte foarte greu până la 3k rpm, am luat o la u tura și merge ceva mai bine că înainte dar nu cu mult. Ce poate sa fie? Mașina tot trage greu, in catalizatorul vechi nu a rămas nimic, miezul s-a topit și mirosea a ulei ars dupa mine, acum nu mai miroase, mașina are 253k km și nu consuma ulei și nu da cu fum, nici înainte nu dădea cu fum. Mulțumesc anticipat!

Hi, I have a 1999 Toyota Celica T23 1ZZ-FE (pre-facelift), and I replaced the catalytic converter with a new one. Before replacing it, the car had very poor power and the check engine light was on with error code P0420 (catalyst system efficiency below threshold). The catalyst core was loose and had been held in place with two screws. I also installed a spacer on the second O2 sensor to prevent the error from coming back, but the car still had no power.

Now, after installing the new catalytic converter, the car still doesn’t pull properly and feels sluggish. On cold start, it revs up very, very slowly until around 3000 RPM. After driving it hard for a bit, it feels slightly better than before, but not by much. What could be causing this?

The old catalytic converter was completely empty inside — the core had melted down, and in my opinion it smelled like burnt oil. Now it no longer smells. The car has 253k km, does not consume oil, and does not smoke, and it didn’t smoke before either.

Thanks in advance!