Catalytic converter for fuel economy

[nasir_shaheen]

Dear frds I recently came to know that someone removed catalytic converter from my corolla x 1.3 before i bought it. Everything is fine. If I reinstall it so will it increase fuel economy? As someone told me that removing it effects o2 sensor reading

[pwuser151070995167]

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[Hassan1991]

Which car you got.
Cat back effects the torque.
Catalytic converter is there to neutralise gasses. In new cars usually o2 sensor came in Catalytic converter, in that case it might be problem. But i don't think fuel efficiency effects. If sensor is misbehaving then it can be.

[nasir_shaheen]

Corolla x 2002

[Naweed]

absence of CAT reduces economy .. get a kabli one installed

[sohelahmed]

yes it will improve but no miracles...

[anon35615524]

Bro, mujhay aapki car / model ka zyada nai pata, but as a general thumb rule; Catalytic Converters utarnay nai chaheyein. They are there for a reason! And agar Oxygen Sensor, Catalytic Converter mein lagta ho, then Catalytic Converter utarnay sey aapko oxygen sensor b utarna paray ga, aik nai, do nuksa'an! and warning-lights in dashboard too!

I would suggest k aap kabli / used lagwa lein, but lagwayein zrur.
Do also check where Oxygen sensor is installed in your car.

I think, fuel efficiency also gets disturbed after removing Cat Conv.

[nasir_shaheen]

Ok I will try to find it to reinstall it. In corolla x cat and 02 r installed down side almost under gear lever.