Hi guys, sorry for my first post being a "help me" post, I was hoping it would be a "check out the new wheels" post. I bought my blazer about 3 weeks ago and have put about 1,000 miles on it.
Anyway, it's a 2001 Blazer LS 2 door. 4.3, 5 speed. 110,000 miles.
The ses light came on so I had a neighbor hook it up to is diagnostic tool on his laptop.
Here's what we saw:
P0141 o2 Sensor Bank 1 Sensor 2
P0335 Crank position sensor circuit A
P0306 Cylinder 6 misfire
P0300 Random misfire.

On the scan, the Bank 1 Sensor 2 o2 sensor was stuck at 99% or around 900mv.
So I was thinking, wouldn't the truck be running rich if this was a true reading? The truck seems to be running normal, through all RPMs. Idles consistent, no smoke, leaks, knocks.

We cleared the codes and I will see which ones come back. I'm confused since the truck runs and sounds fine. Could these codes have been addressed before I bought the vehicle, but not cleared?

Thanks in advance,
Chris

 

Any ideas?

 

I do believe there is a backlog of codes. I had a bad fuel pressure regulator setting off codes, and saw an abs code but never had a light on for the abs or any problems with it.

 

A lot of times the sensor, particularly the heated units, burn up. Truck will still run fine. Put a new sensor in, and it's fine.
About 2 years ago I had the cam sensor go (It's in the distributor).
Replaced it, and the misfire codes went away too.

 

thanks for the input guys. I bought a cheap code reader (all i need is to read and clear them) so i'll see which ones came back and if the o2 sensor code is still there i'll start my troubleshooting there...or just keep deleting the codes ha!