2003 S7 with 73K miles, got Service Engine Soon light on with a code P0150. But after I changed all four o2 sensors, the following six codes came out and the Service Engine Soon light stayed on after about 100 miles test drive.

P0130
P0150
P0135
P0155
P0141
P0161

By looking at the book, it looked the above codes told all four new replaced O2 sensors were malfunctioning. Checked all connectors they all seemed fine. Don't really know what's going on. and can I still drive the vehicle or need to do the O2 sensors again? How can I tell if the new sensors are not working other than reading the codes?

 

to add to the above post, I changed all 8 sparkplugs too, the right bank I got four black plugs, but the left bank was pretty dry and clean at the time I changed the O2 sensors.

 

Where did you get your sensors from?

 

What brand of 02 sensor di you install??? Did you get the 2 different sets, 2 for the front and 2 for the rear, did you put them in the wrong spots?
You are going to need to get into a good shop where they can scan and watch the operation of the 0's.

 

I got the sensors from a part store from Texas. There were aftermarket ones at $65/each.

 

They came in with different plugs for the front and rea, so shouldn't be mixed.

 

WHAT BRAND?????????????????????????????? BY NAME would help.
Go find a good shop, this is nothing you can fix.

 

Hey Mike, I'm about to replace the O2's in my 94 Disco, what brand do you recommend? There are only 2 sensors on my truck, can I get them mixed up or does it matter what spot I put them?

 

Just checked the box, no brand name at all. A friend bought them for me from a store called PartTex in Texas.

Does it imply that I may need another set with brand names like Bosch or something?

 

Sounds like you have more than bad sensors. Unless all of them are bad.... Find a local shop with a Rover scanner and have it checked out. Another option would be to find out what brand of sensors you got or just return them and get good one's.