Running Rough

[R4cup]

Guys ive already done a search but not 100%

I was on my way home last week when i noticed a great loss of power which also caused my car to misfire. The car sounded to me like 1 of the coil packs were down & it was running on 3 so i decided to replace 1 along with a set of sparkplugs, made no difference
So i deided to get my car scanned which came up with these faults

16524 P0140 O2 Sensor circuit,Bank 1-sensor 2: No activity detected

17511 P1103 Bank 1 Sporadic probe 1 heating circuit: output too low

16486 P0102 Mass Air Sporadic: Flow circit-G70: Low input

I am looking to replace the O2 sensor before the cat but was thinking will it be best to replace both? Can i confirm it is this by disconnecting the sensor 1st then running the car?
Also i tried my friends MAF which made no difference so im thinking what the last code might mean it is on the way out?

 

[R4cup]

anyone

Anyone?

 

[ian_cupra]

the last code may have been brought on by the o2 sensor failing, get that changed and go from there

 

[Reuvers]

don;t replace both. they are shockingly expensive

 

[R4cup]

the last code may have been brought on by the o2 sensor failing, get that changed and go from there

OK will i am going 2 disconnect the O2 sensor tonight & let u know how i get on.

Thanks