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Oxygen

A colorless, gaseous, tasteless, element (O) that makes up 21% of the atmosphere.

P0420 and P0421: Catalyst Trouble Codes

P0420 and P0421: Catalyst Trouble Codes

These trouble codes are both signs of catalyst efficiency problems. Learn what can cause these codes, and what to do about them.

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P0421: Warm Up Catalyst Efficiency Below Threshold

P0421: Warm Up Catalyst Efficiency Below Threshold

Seeing P0421 on your code reader? Learn some common causes and solutions to the problem.

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Forced induction muscle car resting on the road in the light of the setting sun. A wastegate peaks out from the top of the hood to allow compressed air to escape from this supercharged or turbocharged ride.

Forced Induction: Superchargers and Turbochargers

Forced induction can add a lot of power to an engine. Learn more about turbos and superchargers.

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P0135: Oxygen O2 Sensor Heater Circuit Malfunction

P0135: Oxygen O2 Sensor Heater Circuit Malfunction

Reading P0135 on your code reader? Learn what causes this issue and what you can do to fix it.

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P0303: Cylinder #3 Misfire

P0303: Cylinder #3 Misfire

Seeing P0303 on your code reader? Learn some common causes and solutions for this error code.

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AutoZoner consulting his OBD reader and attempting to determine how to fix code p0136

P0136: O2 Sensor Circuit Low Voltage (B1S2)

Just ran an OBD scan and got P0136? Find out common causes and solutions.

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AutoZoner scanning for P0102

P0102: Mass Air Flow (MAF) Circuit Low

Seeing P0102 on your scan tool and wondering what gives? Check out this guide for common causes and solutions.

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P0300: Random Misfire Detected

P0300: Random Misfire Detected

Seeing P0300 on your code reader? Learn some common causes and solutions.

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P0420: Catalyst System Efficiency Below Threshold

P0420: Catalyst System Efficiency Below Threshold

Seeing P0420 on your code reader? Learn some common causes and solutions for this issue.

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