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Old 07-12-2019, 04:19 PM   #1
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P0138 help please

So I'm about at my wits end with this code. Little back story. Installed lt and a cam. Got a custom tune from Jay. Everything ran great no issues. A couple weeks go by and I start my truck. It catches and shuts down. First time that ever happened. Soon as it did a check engine light came on. As you can guess P0138. Bank 1 sensor 2 high voltage. Turned the key fired right up no issues with that since. However for the life of me I can not figure out a solution for this code. I've tried clearing it as well. So far I have

Swapped the rear 02 sensors with each other

Swapped the front 02 sensors with each other

Swapped the wiring harness 02 extension cables around.

Inspected for bad pins; loose connections

All to no avail. I'm starting to wonder if my pcm took a crap. If anyone has any advice I would greatly appreciate it. I'm beating my head against a wall

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Old 07-12-2019, 06:54 PM   #2
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Ask jay if the sensors are both still enabled in the tune fully or disabled?

Also unplug the sensor and turn the key on a test the voltage on the two sensors wire they are normally blue and white the blacks are the heater. See what you get for a voltage
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Old 07-13-2019, 04:03 AM   #3
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Jay said they are both on. I wanted to be able to pass emissions. I am running high flow cats.

I tried yesterday but my meter kept jumping all over the place. What voltage am I looking for?
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Old 07-13-2019, 04:35 AM   #4
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Unplugged key on across those two wires should get you .450 range
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Old 07-13-2019, 04:37 AM   #5
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Thanks for the reply. I was putting black lead to ground. I'll test going red to one pin and black to the other.
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Old 07-13-2019, 04:39 AM   #6
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Do they plug into the OBDII port or do you just need to be clear of codes? Should beable to turn the rears off and code will clear. High flow cats can be a problem as true high flow cats are designed for OBDI emissions.
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Old 07-13-2019, 04:43 AM   #7
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Its MD. They plug in. You need so many hours of log time or you fail. The passenger cat seems fine. Throwing no codes. Would an 02 defouler work in this case? I still want to check voltage
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Old 07-13-2019, 04:59 AM   #8
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I remember asking jay if we could turn them off and he said it would fail emissions soon as they plugged in. I have all proper emissions related parts so I didnt think it would be a big deal... until now lol
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Old 07-13-2019, 05:02 AM   #9
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Also 2ould installing a wideband 02 help?
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Old 07-13-2019, 07:17 AM   #10
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You have swapped the sensors and harness without changing the code. How new are the cats? Are they cheap ceramic core or steel core? Aftermarket cats are not required to meet oem standards and are often junk. Ceramic cores can break down at 1800 degrees. Steel are the true high performance cats and can stand 2800 degrees. Steel flow 20-30% better than ceramic with similar cell count. Cell count 200-400 are typical of the higher quality cats. You can test by removing the sensor and plugging the sensor port. Leave the sensor plugged into it's harness. The code should clear after a couple engine cycles.
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