the o2 sensor before the cat is reading low voltage.so I check it and the sensor is broken what kind of problems will this cause beside the SAS light coming on will this have any affect on how it runs.it's ruing ruff an has a smell of carbon out the exhaust but no smoke and had a TPS code and change it and now the idle is all over the place high then normal with a wried loop at idle in gear.And just did a tune up about 2 month a go and this make the 2 TPS that Ive put on it and cleaned all the carbon off and behind throttle blade.and forgot to say it a 95,4.3 cpi with odb 1.5 and 2 o2 sensors , any help would be great and welcome.thanks