CEL for B2 / S1

[mchaffin]

I am sure that this is posted somewhere, but I can't locate anything. I am not a master mechanic by any means so I will do my best to give what info I can.

2012 Ram 1500, Hemi 5.7 ltr with a CEL that codes out for Bank 2 Sensor 1. The O2 sensor has been changed out. Still getting code. It shows a constant 1.27 volts. What am I missing on this problem?

I did just change out the exhaust manifold gaskets last weekend as they were leaking from broken bolts. And help would be greatly appreciated. The plates expire at the end of the month and I have to get it emissions tested. Oh what fun.

 

[Burla]

After market sensor? What happened to the original and did the original throw a code? Always post code. Get OEM sensor if it isn't, and try a spacer? The original code was there before you did gasket?

 

[Burla]

Try a hard reset as well and go on a long trip, like 50 miles. If you want to give the latest sensor a chance. Have you gone 50 miles on new sensor, much freeway?

 

[Burla]

I'll let Mr ai explain why 50 miles...

To help emissions codes clear and ensure your vehicle passes an emissions test, aim to drive your car for 50 to 100 miles, encompassing a variety of driving conditions, after clearing the codes.

Here's a more detailed explanation:

• Why drive after clearing codes?
  When you clear emissions codes, the vehicle's computer (OBD-II system) needs to run diagnostic tests again to ensure the issue is resolved and to verify that all systems are functioning correctly.
• The "Drive Cycle":
  This 50-100 mile drive is often referred to as a "drive cycle" because it allows the vehicle's computer to complete its self-diagnostic tests under various driving conditions.
• Not just one long trip:
  While you can drive 50-100 miles in one trip, it's often recommended to take several shorter trips with engine starts and stops to ensure all systems are thoroughly tested.
• Check for "Readiness":
  After completing the drive cycle, you can use an OBD-II scanner to check if all emissions monitors are "ready" for an emissions test.
• Varying conditions:
  Ensure you drive in a variety of conditions (city, highway, stop-and-go traffic) to test all the systems thoroughly.

I was there when a smog station failed a guy and told him to drive 50 miles because they detected a clear code but needed the 50 miles to clear correctly, just a couple months ago.