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i get a slight hesitation when i try to accelorate hard in my 98 x5 sohc. i know i get codes
P0136- O2 sensor on bank 1 sensor 2
P0133- O2 sensor not reading or sending info slowly
P0446- Purge control valve needs replaced

i did recently replace my TPS sensor which felt the same way, could it be that?? bad tps? i have had the o2 code since i had it, dont wanna spend 100 for a 600 dollar car and still get almost 40mpg. i get a hesitation when i have a constant speed around 50-60mph and thats when i get the P0446 code.(will be replacing this weekend). also did plug wires about month ago, could it be faulty spark plugs?? currently shows no code but still get the hesitation on acceloration , especially from a stop. any ideas......
 

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you can go on ebay for like $30.00 usd for an o2 sensor and they are extremely easy to replace but yeah start the vehicle let it warm up and if the cat converter starts to glow red then you have a plugged cat
 

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Change your 02 sensor after the catalytic converter
 
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