Hello, wonder if someone can help

I own a 2003 Blazer, V6, 4.3 L, RWD, 2 door, she has 95,000 on the clock kept up to date with oil/filter changes etc etc, once a month i put in some fuel injector cleaner in to the gas tank...

anyhow...

0ver the last 2 months the check engine s00n light was coming on and off, now it is on all the time, Also, now when I boggy up hill, I also smell sulfa, so I took it to my friends house and he plugged in the obdII puter into the socket, it read the following codes:

PL 155.... 02 sensor number 2 Bank 2.... heat malfunction
PL 155.... 02 sensor NUMBER 1 bank 2... heat malfunction
**end of error codes **

can someone tell me where are the 0/2 sensors are located (as per above) i have tried the thing but can only find V8 engines even on the auto zone its shows a V8 lump.

2nd Question,
how many wire are there on the above 0/2 sensors 1, 2 or 4 i don't have a Haynes manual but thought i could just order the 0/2 sensors and replace them but not sure if they are all the same confg. or if they are all different wires, according to A-zone, there are only 3x 0/2 sensors Total.

3rd question, is there anything else i should be looking at to replace as i am under the lid of the Blazer ?

thank you for any help
M. AZ

 

Anybody ???

 

Please obey forum rules and wait 24 hours before bumping your post. the o2 ensors are on the exhaust tube. their is no bank 2 sensor 2, their is B1S1, B1S2 and B2S1

B1S1 = In right pipe before catylitic converter
B2S1 = In Left pipe before Catylitic converter
B1S2 = In exhaust pipe after Catylitic converter

and all the sensore are four wire sensors, you will need a special 02 sensor socket or a 22mm combination wrench to change out the sensor. and DONT BUY BOSCH 02 sensors!!! They have been proven bad by numerous users on this forum!

 

What were the specific OBDII codes? Should be Pxxxx where there are numbers in place of the 'xxxx'.

 

Error codes reported where:

PL 155
PL 155

thanks for the reply...

****** hi
all the codes that got reported back was PL155 and PL155

*********** Question, What make would you recommend to replace with ? and what else should i replace while i have the lid up ?

thanks for the info tho...

 

Those are not OBDII error codes. Scan it again with a proper tool.