I recently got the CEL on my 97 E420 the error codes are P0141 and P0136 which has to deal with installing a new O2 sensor where can i get a new one from besides the stealership.

 

post cat o2 sensor. If it is lazy or failed it could throw that code. If over 100k miles it is time anyway. The only thing to watch out for is those codes also pop up when a cat if failing so you may want to have them tested on a sds scanner.
www.autohausaz.com has the o2's free shipping.

 

Thanks I appreciate the input, I will definately have that checked out.

 

How many sensors are there? I thought there were two but the listing on the Autohaus AZ site makes it seem like there's four. My E430 is throwing a P0156 and P0161. Although with 113k on the clock, they're all due anyway.

 

430 has 4 2 pre cat 2 post cat.
Your drivers side rear cat is going bad.

but miles say change them all.
get the proper o2 socket

 

So there really ARE four sensors... Criminy! Got spoiled with just one sensor for the W124.