Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
Your car's engine is not getting enough fuel on one side, so it's like trying to run with not enough energy.
The engine control module (ECM) has detected that the air-fuel mixture on bank 2 is too lean, meaning there is too much air and not enough fuel.
The P0174 code indicates that the ECM has detected a lean condition on bank 2. This means the oxygen sensor has detected that the air-fuel ratio is too lean, which could be due to a variety of factors including a vacuum leak, faulty fuel injector, or a problem with the mass air flow sensor.
• Check Engine Light is on
• Poor fuel economy
• Engine misfires
• Vacuum leaks
• Faulty mass air flow (MAF) sensor
• Clogged fuel injectors
ECM: Engine Control Module
MAF: Mass Air Flow
• Check for vacuum leaks
• Inspect the mass air flow sensor
• Test the fuel injectors
• Repair any vacuum leaks
• Clean or replace the mass air flow sensor
• Clean or replace fuel injectors
• OBD-II scanner
• Vacuum gauge
• Multimeter
$150 - $500
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly clean the mass air flow sensor
• Perform routine maintenance on fuel injectors
• Check for vacuum leaks periodically
Engine Performance
• Do not ignore the Check Engine Light
• Get a professional diagnosis if unsure
• Regular maintenance can prevent this issue
Check your vehicle's warranty for coverage on fuel system components.
P0174 has been a common code for vehicles with aging fuel systems or air intake components.
Moderate – It may not cause immediate damage but can lead to poor performance and increased emissions.
Driving with a lean condition can cause increased emissions and may not pass emissions testing.
• Engine at operating temperature
• Vehicle in closed-loop mode
Bank 2 refers to the side of the engine opposite bank 1, often the passenger side in a V-type engine.
Q: Can I drive with a P0174 code?
A: It's possible, but it's not recommended as it can lead to poor performance and increased emissions.
Q: What happens if I ignore a P0174 code?
A: Ignoring it can lead to engine damage over time due to running too lean, and it may cause your vehicle to fail emissions tests.
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Network faults often require full-system access instead of a generic code reader alone.
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Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
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Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
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Fitment Required · Vehicle-fitment part
Relevant when the code or supporting diagnostics point toward upstream or downstream oxygen-sensor faults.
This code family often involves upstream or downstream oxygen-sensor diagnosis.
Verify exact sensor position and vehicle fitment before buying.
View options on Amazon
Fitment Required · Vehicle-fitment part
Commonly relevant for misfire, ignition-efficiency, and some drivability-related repairs.
Misfire and ignition-related faults commonly involve spark plugs as part of the repair path.
Check the correct plug type, gap, and engine application for your vehicle.
View options on Amazon
Fitment Required · Vehicle-fitment part
Relevant when the fault points toward ignition-coil performance or cylinder-specific ignition issues.
Some ignition faults involve coil performance or cylinder-specific coil problems.
Match the coil to your engine and confirm the failed component before ordering.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.