mph1978

Hey, so I had the carbon buildup warranty extension service performed at the dealer about 6 weeks / 2000 miles ago. I hit the gas through a yellow light last week and suddenly got Check VSC, so I pulled over and plugged in the reader. It gave me a 2195 (O2 Sensor Signal Biased/Stuck Lean Bank 1 Sensor 1). By the time I got to the dealer in the morning, I had a few more 2195s and additionally a p0138 (O2 Sensor Circuit High Voltage Bank 1 Sensor 2).

So -- 2 sensors suddenly failing within 10 miles of each other, a month after an engine rebuild.

Lexus wanted to replace them both for $1200, and I said no thanks. I'm looking into replacing them myself or having my usual mechanic do it, but my question to you all is, can you think of something upstream or related to this rebuild that could trigger the sudden failure of both at the same time??

mph1978

Following up, I'm seeing elsewhere on the net that both of these codes happening at once can definitely mean some upstream stuff. Remmy700P at a Tundra forum gave a nice breakdown:

1. Clean the MAF sensor.
2. Inspect all vacuum lines/hoses for looseness, cracks, ect. Replace any that are loose/damaged.
3. Run a can of SeaFoam or a bottle of Techron in the tank.
4. Pull the connector on the fuel-air sensor and inspect for corrosion. If OK, apply a light coat of dielectric grease and reconnect the sensor. Make sure it is fully seated. You should hear/feel a click. Clear the code (or pull the negative battery cable for 10 minutes), drive it for about 100 miles and see if the code comes back.

(http://www.tundrasolutions.com/forum...195-and-p0138/)

I'm most suspecting #2 since I already had to take the car back the day after this service, since they didn't connect a coolant line properly and it popped off. Maybe they're not good at hoses

I'll check the MAF myself first though, and clean if necessary.