Catalyst

A lead-sensitive substance, such as platinum, palladium, or rhodium, that accelerates or enhances a chemical reaction without being changed itself. When used in a catalytic converter, it can reduce the level of harmful pollutants in the exhaust.

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.

P0421: Warm Up Catalyst Efficiency Below Threshold

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

How Car Batteries Work

Ever wonder how a car battery works? Read this article and learn how they power your vehicle.

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.

P0420: Catalyst System Efficiency Below Threshold

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