Skip the auto shop - Our mechanics make house calls

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.

A: It is certainly possible that the (pre-cat)...

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?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: the check engine light appears and it gives us the code P0170

The P0170 trouble code does not necessarily go with your vehicle, but it indicates fuel control problems. I recommend the following: Have the fuel pressure tested to see if it is too low or high. Make sure...

Q: Slight miss in truck

The most common cause of a misfire on the engine is dirty fuel injectors. It may be a good idea to have the injectors cleaned. One common issue I have seen also is a failure in the variable valve timing....

Q: Orange fluid leaking from radiator.

GM Dexcool antifreeze is orange in color, so you have a coolant leak. Performing a cooling system pressure test will pinpoint the origin of the leak. A trained professional, like one from YourMechanic, will be able to perform this test...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.