Q: Check Engine Light is on. Codes are Bank 1 Sensor 1 Low-voltage, and Bank 2 Sensor 1 Low-voltage. . .

asked by on January 16, 2017

. . .I just got the vehicle back from the repair shop, where I had to get a new fuel tank installed (it was punctured). Since I've gotten it back, it's got zero power, won't accelerate, feels like the timing is off, or it's not getting fuel, or SOMETHING!! Plugged in the OBD-II diagnostic code reader, and it's giving me O2 sensor troubles. . . .so, i changed the two upstream O2 sensors, and they are still giving me low-voltage trouble codes. Did my mechanic mess something up while he was installing my new fuel tank?

My car has 130000 miles.
My car has an automatic transmission.

Loss of power Inspection $94.99 - $114.99 Get a Quote

Hi there. What seems to be the issue is the fuel pump is not plugged in. The Oxygen Sensors are working and telling you that the system is too lean with having a low voltage reading. If it was just the upstream sensor, then it would be the wiring, however, both sensors are picking up an issue. This is why the engine is running rough and has no power. If you need further assistance with your vehicle having a loss of power, then seek out a professional, such as one from Your Mechanic, to help you.

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・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Fuel pump noise
A loud fuel pump often indicates either excessive cavitation, or mechanical failure is eminent. Either of these issues will lead to fuel starvation and drivability issues. My recommendation is to have a mechanic, such as one from YourMechanic, replace the...
Car stutters in gear and stopped, the check engine light is on
Hello. I would need to know what you replaced to try and diagnose this issue. If you replaced the spark plug and the ignition coil then you may have an internal engine problem. Most of the time this is caused...
ticking noise what is it?
The ticking noise from the engine may be from a solenoid that starts to come on after you start to accelerate, like an EGR valve solenoid (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-egr-control-solenoid). If the noise is from the exhaust, then you may have a leak...
Right headlight randomly goes off
Hello there. A few different parts can cause the bulb to intermittently work. The most likely is the bulb itself beginning to fail. Sometimes they do not fail immediately but will work at times until they fail fully. Other possible...
Car stalls, P0685 code
Hello. Most of the time this is caused by one of two things on your vehicle. It is either because the powertrain control module, or engine computer, is failing internally, or the main relay that supplies power to it is...
My temperature gauge is going from cold to hot in a half mile. The hose going to the thermastat is HOT. Does it sound like the the
If the thermostat is open you will get the hot bottom and top hoses. Check to make sure the fan clutch is locking up and giving enough air flow across the radiator. If you have electric fan style, then is...
My oil filter cap broke
It's very possible that the threads on the housing were damaged or warped when the old filter cap was overtightened so much. If neither of the new caps will cleanly go in, then I would recommend replacing the entire oil...
When I try to take off the engine felt like it wanted to fall out and violently shook until the car slowed down.
Most likely the engine has a plugged fuel filter. A plugged fuel filter will cause the engine to hesitate when under harsh throttle and make the vehicle shake. I recommend replacing the fuel filter and retesting to see if the...
Shifter in park buts says its in drive
Hi There, Unfortunately, it sounds like the shift linkage (https://www.yourmechanic.com/services/shift-selector-cable-replacement) may have been broken during the tow. This can happen when the car is jammed into gear or forced from one gear to the next. The will not come out...

Related articles

What to Do If Your Car Switches Get Wet
Your car switches are electrical components. They operate internal and external vehicle functions that require low currents in some cases...
How Often Do Spark Plug Wires Need to Be Changed?
Spark plugs provide the electricity necessary for combustion to happen by igniting atomized fuel in an engine's cylinders. However, they need a...
The Best Used Cars to Buy If You're a Gardener or Landscape Architect
Gardeners Gardeners and landscape architects need to haul around quite a bit of gear. As a gardener, chances are you will need to transport a variety of mowing equipment, along with smaller implements. You may also need to move shrubs,...