Q: My car is lean on bank one and two. Are the oxygen sensors bad?

asked by on

Gets warm and looses all power obd code reader is sayin that system is to lean on bank one and two and I'm guessing that's o2 sensors ? It started acting up loosing power about two days ago I thought converters were clogged so I hollowed them out still no change but haven't welded them back up yet (can't drive it anywhere) and that means not much air getting to back o2 sensors cause it's goin out the hole right now

My car has 117000 miles.
My car has an automatic transmission.

It is certainly possible that the (pre-cat) O2 sensors were leaning the engine out. It is also possible there is a fuel supply issue: clogged fuel filter, weak fuel pump, fuel pump relay with burned contacts, or a fuel pressure regulator. Engine management tends to do everything it can to protect the catalytic converters, and a lean mix is the preferred default - rich will clog the cats.

I would recommend checking fuel system for proper pressure under running conditions and replacing the pre-cat O2 sensors, especially if they are the originals. I recommend having a certified mechanic, such as one from YourMechanic, come to your location to determine why the truck is losing power and make any necessary repairs.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. My car is lean on bank one and two. Are the oxygen sensors bad?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Q: Where Is the O2 Sensor Located?

Oxygen sensors O2 sensors will always be located in the exhaust system. Their function is to sense how much oxygen remains in the exhaust that is flowing out of the engine, and report that information to the vehicle’s engine control...

Q: Q: I have water and fuel in my oil

This is due to a possible blown head gasket near the number 6 cylinder on the engine. You have aluminum heads and may have a crack in the head. I would recommend having the system checked by a certified technician...

Q: my trans malfunction warning light came on and 1st and second gear is slow. what can i do

When a module illuminates a warning light, generally there is a fault code that accompanies it. there can be many reasons for the concern like a low fluid level or a failing internal transmission component. Fluid leaks are common as...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...