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Likely the lambda sensor in front of the cat it controls fuel trim.
The sensor after the cat is there to see if the cats working and doesn’t effect fueling.
Swap the plugs around and see if the misfire follows.
If it stays on cylinder 3 then you can swap the injectors round to see if that’s the issue.
If it still stays on 3 then coil pack.
I imagine lots of folk know this already but figured out the other day you can fit a normal hacksaw blade to a recip saw.
Real handy if you need to bend round a corner slightly to get down a tight gap.
Post a picture of the sensor as I’m not sure which one you mean.
If the radiator is leaking then it needs replacing.
The dashboard lights indicate a fault and are putting the car into limp mode hence the poor throttle response.
Swapped out the cabin filter.
New bosh wiper blades.
Fitted a new brake pedal switch as it was flagging up on the code reader.
Took it for a run down the motorway, returned 55mpg pleased with that.
Backfiring and lack of power indicates a misfire, this could be caused by any number of things but usually Injectors, Coil pack or spark plugs.
Do you have any misfire codes?
If the second sensor is the same as the 1*2 it doesn’t do anything to the fuel trim and is just there to confirm the...