Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer has detected that the fuel being mixed with air in cylinder 2 isn't right. It's like when you're baking and you put too much sugar or not enough flour in the mix.
The engine control module (ECM) has detected an imbalance in the air-fuel mixture for cylinder 2. This can affect engine performance and emissions.
The P23F3 code indicates that the ECM has identified an air-fuel ratio imbalance for injector B in cylinder 2. This imbalance can be due to a variety of factors such as injector malfunction, air leaks, or sensor issues, leading to inefficient combustion and potential engine performance issues.
• Check Engine Light on
• Poor fuel economy
• Rough idle
• Faulty fuel injector
• Air intake leak
• Faulty oxygen sensor
ECM: Engine Control Module, the computer that controls engine functions.
Air-Fuel Ratio: The ratio of air to fuel in the combustion chamber, crucial for efficient engine operation.
• Use an OBD-II scanner to confirm the code.
• Inspect the fuel injector for cylinder 2.
• Check for air leaks in the intake system.
• Replace or clean the fuel injector.
• Repair any air intake leaks.
• Replace the oxygen sensor if faulty.
• OBD-II scanner
• Fuel injector tester
• Vacuum leak detector
$150 - $500
Moderate
• Toyota Camry
• Honda Accord
• Ford F-150
• Regular maintenance of fuel injectors
• Routine checks for air leaks
• Timely replacement of oxygen sensors
Engine Performance
• Have your vehicle inspected by a professional.
• Avoid driving long distances until the issue is resolved.
Check with your vehicle manufacturer for warranty coverage on fuel injectors and related components.
This code is relatively rare and often associated with specific vehicle models known for injector issues.
Moderate – It's important to address this issue soon to prevent further engine damage.
Ignoring this code may lead to increased emissions, which could be illegal in some areas.
• Engine at operating temperature
• Idle and light load conditions
The fuel injector for cylinder 2 is located on the engine block, typically near the intake manifold.
Q: Can I drive with a P23F3 code?
A: It's not recommended to drive for long periods with this code, as it can lead to engine damage.
Q: How do I know if my fuel injector is faulty?
A: Symptoms include rough idling, poor fuel economy, and a noticeable decrease in engine performance.
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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 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.