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Coolant

A trade name used to describe an early after-market hang-on or under-dash, after-market air-conditioning system.

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 explaining coolant to a customer to ensure answer any antifreeze questions

What Is Antifreeze and What Does It Do?

Ever find yourself wondering about how automotive coolants work? Us too. Learn what you need to know about antifreeze.

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AutoZoner scanning a Dodge truck for P0106

P2181: Cooling System Performance

Reading P2181 on your code reader? Find out what this code means and how to fix it.

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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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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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