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Black Smoke

The exhaust that is produced when the air/fuel mixture is too rich.

AutoZoner using FixFinder to read P0700 trouble code.

Code P0118: Engine Coolant Temperature Sensor Circuit High Input

Learn what Trouble Code P0118 means, the cause, and how to fix it.

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Code P0121: Throttle Position Sensor/Switch A Circuit Range/Performance Problem

Code P0121: Throttle Position Sensor/Switch A Circuit Range/Performance Problem

Learn what Trouble Code P0121 means, the cause, and how to fix it.

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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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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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