Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's computer is having trouble keeping the right mix of air and fuel in one of the engine's cylinders. It's like trying to bake a cake but not having the right amount of ingredients.
The engine control module (ECM) monitors the air-fuel ratio in each cylinder. If it detects that the ratio in cylinder 3 is not within the expected range and cannot be adjusted further, it triggers this code.
The P230C code indicates that the ECM has detected an air-fuel ratio imbalance in cylinder 3. This imbalance means that the mixture of air and fuel is not optimal for combustion, which can affect engine performance. The ECM attempts to adjust the ratio, but if it reaches its limit without success, the code is set.
• Check Engine Light is on
• Poor fuel economy
• Rough idling
• Faulty fuel injector
• Vacuum 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 engine's combustion chamber.
• Check for any vacuum leaks around cylinder 3.
• Inspect the fuel injector for cylinder 3 for clogs or damage.
• Test the oxygen sensor for proper operation.
• Replace or clean the fuel injector for cylinder 3.
• Repair any vacuum leaks found.
• Replace the oxygen sensor if faulty.
• OBD-II scanner
• Multimeter
• Fuel injector cleaning kit
$150 - $500
Moderate
• Toyota Camry
• Honda Accord
• Ford F-150
• Regularly maintain fuel injectors.
• Check and replace air filters as needed.
• Ensure oxygen sensors are functioning properly.
Engine Performance
• Avoid driving with this code for extended periods.
• Get the vehicle checked by a professional mechanic.
Check with your vehicle manufacturer for warranty coverage on engine components.
This code has been associated with issues in vehicles with direct fuel injection systems.
Moderate – It should be addressed soon to avoid further engine performance issues.
Ignoring this code may lead to increased emissions and could affect the vehicle's compliance with emissions regulations.
• Engine at operating temperature
• Vehicle idling
Cylinder 3 is located on the engine block, typically on the passenger side in a V6 or V8 engine.
Q: Can I drive my car with a P230C code?
A: It's not recommended to drive for long periods with this code, as it can lead to poor engine performance and increased emissions.
Q: How can I prevent a P230C code?
A: Regular maintenance, such as cleaning fuel injectors and replacing air filters, can help prevent this issue.
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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 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.