#engine diagnostic codes

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P0304 Code – Cylinder 4 Misfire Detected

What Does the P0304 Code Mean The P0304 code indicates that the engine control unit (ECU) has detected a misfire in cylinder 4. A misfire occurs when the air-fuel mixture inside the cylinder fails to ignite correctly during the combustion process. Modern vehicles use sensors to monitor crankshaft speed and combustion stability. When the ECU detects irregular combustion repeatedly in cylinder 4,…

P0304 Code – Cylinder 4 Misfire Detected

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P0302 Code – Cylinder 2 Misfire Detected

What Does the P0302 Code Mean The P0302 code indicates that the engine control unit (ECU) has detected a misfire in cylinder 2. A misfire occurs when the air-fuel mixture inside the cylinder fails to ignite properly during the combustion cycle. Modern engines monitor combustion efficiency using crankshaft speed sensors and misfire detection algorithms. When irregular combustion is detected…

P0302 Code – Cylinder 2 Misfire Detected

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P0301 Code – Cylinder 1 Misfire Detected

What Does the P0301 Code Mean The P0301 code indicates that the engine control unit (ECU) has detected a misfire in cylinder 1. A misfire occurs when the air-fuel mixture inside the cylinder fails to ignite properly during the combustion process. Modern engines monitor crankshaft speed and combustion efficiency to detect misfires. When irregular combustion is detected repeatedly in cylinder 1,…

P0301 Code – Cylinder 1 Misfire Detected

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P0174 Code – System Too Lean Bank 2

What Does the P0174 Code Mean The P0174 code indicates that the engine control unit (ECU) has detected a lean air-fuel mixture on bank 2 of the engine. A lean mixture means that too much air and not enough fuel is entering the combustion process. Modern vehicles rely on oxygen sensors to monitor the exhaust gases and maintain the correct air-fuel ratio. When the ECU detects that the mixture on…

P0174 Code – System Too Lean Bank 2

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P0172 Code – Engine Running Too Rich

What Does the P0172 Code Mean The P0172 code indicates that the engine control unit (ECU) has detected a fuel mixture that is too rich. This means the engine is receiving too much fuel and not enough air, which affects combustion efficiency and emissions. Modern vehicles constantly monitor the air-fuel ratio using oxygen sensors located in the exhaust system. When the ECU detects that the mixture…

P0172 Code – Engine Running Too Rich