02 sensor problems

[Tdean91491]

Alright guys I’ve checked all my fuses & replaced all four of the 02 sensors on my 96 k1500. The exhaust ive got ran is stock from the manifolds to the flange behind the converts with no muffler to dual exhaust the rest of the way. I’m still getting this code here any ideas ?

You must be registered for see images attach

 

[Deathpunch0311]

I kept having those downstream sensors giving me problems. I have a buddy with HP Tuners, 10 mins and tuned them out. Along with the vats/passlock security bullsh1t and EGR.

 

[df2x4]

If you're sure that the sensors and wiring are good (what brand sensors did you use?) then there's a good chance that your cats are bad. I had this same issue with my red truck. It's a V6 so it's only got one cat and sensor bank, but it had a persistent P0140 code even after I replaced the bank one position two sensor with a new ACDelco unit. Put on a Magnaflow Y-pipe/cat and the code disappeared.

 

[Deathpunch0311]

IIRC I read somewhere that these trucks really favor AC Delco and Bosch o2 sensors. I went through 4 down streams before I had them tuned out.
But I had new cats when my kept going. Like df2x4 said check your cats they could be clogged/bad.

 

[east302]

Here’s the diagnostic table for P0140 for a 98. Maybe it will help for your 96.

Do you have any exhaust leaks upstream of these sensors?

You must be registered for see images attach

You must be registered for see images attach

You must be registered for see images attach

You must be registered for see images attach

You must be registered for see images attach

You must be registered for see images attach

You must be registered for see images attach

You must be registered for see images attach

Connector C1 at VCM:

You must be registered for see images attach

You must be registered for see images attach

Sent from my iPhone using Tapatalk

 

[Tdean91491]

I appreciate all the feed back guys! I’ll start from the top and go from there. I sure thought those sensors would have fixed it. The sensors are denso sensors. I haven’t heard any leaks but I’ll throw it on the lift while it’s running and check. & east302 I’ll try to decipher what you posted this afternoon when I get off work.


Sent from my iPhone using Tapatalk

 

[Schurkey]

WHAT ARE THE VOLTAGE READINGS those sensors are producing?