O2 sensor suddenly died. Was a brand new Bosch unit, maybe 75 miles on it. Got p0130 code. Grabbed the code reader, looked at live data, and bank 1 sensor 1 was dead at 0.000 volts. The code reader also says bank 1 is stuck in an open loop fault likely because the sensor isn't doing anything.. anyway, Pulled it, returned it, got a new Bosch unit. Installed it. It also reads 0.000 volts. What gives? Truck runs great.

 

Zero volts could mean an open circuit in the wiring. Usually that could occur at a connector, but could be in the middle of a wire. Other possibility is the input circuit of the ECU got damaged.

 

So....what just start tracing wires? That's a reeeaaalllllyyy crap spot to try and diagnose an electric problem lol...dang.

 

check the connector for corrosion and/or a broken pin.

 

it started reporting voltage, but very very low. Like 0.0015

 

Swap them left to right and see if it follows (probably won't ). After than the easiest is to swap a spare ECU in if you have one (always good to keep a spare set of ECU-BCU-IC). If you don't want to do that you are tracing wires for the open circuit, there are no splices between the ECU and the connector so just get out your long ohm meter leads and check both ends for continuity. BTW I did have an ECU where an 02 sensor driver just died, swapping ECU fixed it.

 

I was hoping you'd turn up to my post lol.

So... if switching o2 sensors does nothing, you are saying my ecu is bad?

 

Whoa Nelly, let's not jump to a bad ECU or bad harness quite yet.

O2 sensors are known to sometimes be bad out of the box, or fail soon after being installed. It's happened to me twice with Bosch sensors. Anecdotal info from this forum suggests it's more often a problem with Bosch sensors; Walkers are now recommended.

O2 sensors can be bench tested if you have at least a small torch. I did so years ago. Look for YouTube videos. I clamped the sensor in a bench vise and connected a multimeter. I don't recall which pins in the connector to use, but you can figure that out from the RAVE Workshop Manual or Electrical Library PDFs.

Once you are setup, just apply heat to the sensor tip and watch the multimeter voltage readings. Voltage should cycle quickly up and down as heat is applied and removed.

If you don't have a torch and vise (or Vise Grips), then swapping the sensors left to right is probably the next easiest alternative.

 

Why are there so many responses on this and nothing on my Automated Corner Enhancement System pipe.

It's a O2 sensors. Unscrew the plugs, undo the clips .. install the new sensors .. clear the codes .. .its routine plug play job. 20 minutes tops. It's one of the easiest parts you can fix. Maybe only the Master Airflow Meter is easier..

You bought a Dud. Sorry. Buy another. Chances are it will work. That's life after 2020. Things have changed. I got 2 Crank Position Sensors that failed after 500 miles.

For O2's Some say walkers are best. I only use Bosch.

 

What is odd, is that a new one was good, then failed suddenly, within 100 miles or so of being replaced. Returned it. New one seems dead on arrival? That would be totally plausible, but some epicly poor luck lol.

When I got the truck, the same sensor (b1s1) was reading extremely low voltage, circa 0.015 volts or so. That's what made me replace them, even though they technically seemed to be functioning- I also had no o2 sensor codes at the time. Just the one with really low voltage.

I ordered a Denso unit, because my local parts star can't get the Walkers which seem to prevalent across the pond. Hopefully that fixes the issue.