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Codes On My Celica Vvti 140bhp


DANNY1210
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Urgently need some one to help me please. My cat has been on the way out for some time now, but today I learned that my rear brake plates are pretty messed up so they need replacing if anyone can direct me to a cheap way that would be great! I tested my car today via plugging it in and I got codes P0171, P40420 and also P0133.... Can anyone help me with the likely hood of these codes please????? I'm worried :-( Thank you 

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P0133 = Oxygen sensor circuit slow response Bank 1 Sensor 1

P0171 = System too lean ( fuel trim )

P0420 = Catalyst system efficiency below threshold

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What do I need to do to make these go away? Any idea? Thank you for getting back to me appreciated 

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