What causes a P0420 code? (VIDEO)
If the front signals and the rear signals look identical, the catalyst is not doing its job. Sponsored by AP Emissions.
Mitchell 1 2022 Emission Control Guide Available Now
A must-have resource for those doing emission testing and/or repairs.
Scan Codes With Electronic Specialties’ Code Buddy PRO+
The Code Buddy PRO+ can display the full live data stream, giving valuable feedback while the vehicle’s engine is running.
Emissions 101: A Basic Understanding Of How Catalytic Converters Operate
When servicing catalytic converters, it’s important to have a basic understanding of how they operate.
Catalytic Converters: Efficiency Code Diagnostics
Understanding catalytic converter efficiency codes can be a long diagnostic road that can either lead to a happy customer or an expensive comeback.
Hyundai Fuel System And Emissions Diagnostics
We recently had a 2002 Elantra GLS in the shop with assorted issues, so let’s take a look at this job since it’s a good example of some common problems we see.
Aging Oxygen Sensors Hurt Fuel Economy, Performance And Emissions
Oxygen sensors are used to monitor the engine’s air/fuel mixture so the powertrain control module (PCM) can make adjustments that optimize fuel economy, emissions and performance.
The Case Of The Missing Code On A Chevy Tahoe
The Tahoe’s owner complained that it would stall at highway speed, but it would always restart and usually proceed without further incident until it reached home.
Failing O2 Sensors Result In Increased Emissions And Fuel Consumption
The engine computer needs to know what the fuel mixture is with a high degree of precision so it can optimize fuel economy as well as emissions. If the information received by the powertrain control module (PCM) from its sensors is not accurate, it may command too much fuel or not enough.
Converter Codes: How Long Will The Light Stay Out?
Even if the converter is operating below 95% efficiency or the oxygen sensor is bad, the chances of the light coming right back on are slim. If you clear the code, the light might stay off for a while until the system goes through two readiness cycles. This might take a couple of days or a couple of weeks. But, no good deed goes unpunished because the customer will be back and your quick fix will be forgotten.
