focus st170 problem

[jack_st]

Hi can anyone help me.got a 2004 st170 and the engine management is on and started to stall only when it was hot.had it on the computer and found the first o2 senser on the cat had blown so we changed both sensers on the cat.reset the ecu light went out. took it up the road light came on.put it back on the computer and it's saying the first o2 senser again. turned the light off 3or4 times now and it still stalls. im just getting no where with it.can anyone sugest what it could be.im wounderin if it could be a faulty senser?

[martycossie]

check fuzes

[neiljohnson]

jack_st said:

Hi can anyone help me.got a 2004 st170 and the engine management is on and started to stall only when it was hot.had it on the computer and found the first o2 senser on the cat had blown so we changed both sensers on the cat.reset the ecu light went out. took it up the road light came on.put it back on the computer and it's saying the first o2 senser again. turned the light off 3or4 times now and it still stalls. im just getting no where with it.can anyone sugest what it could be.im wounderin if it could be a faulty senser?

I would be looking for an air leak somewhere on the inlet side first as if its sucking in air it can confuse things & throw up lambda faults due to the air being sucked into the engine.

[jack_st]

ok mate cheers i'll have a look!