Engine Light ON (or Service Engine Soon Warning Light)
P0430 GMC Possible Causes
Faulty Three-way Catalyst Converter Bank 2,Exhaust Tube,Intake Air Leaks,Faulty Oxygen (O2) Sensor,Faulty Fuel injector(s),Leaking Fuel Injector (s),Faulty Spark plugs,Improper Ignition Timing,Faulty Engine Control Module (ECM),Dirty Air Filter
P0430 GMC Description
In order to maintain a reasonably low emissions of Hydrocarbons (HC), Carbon Monoxide (CO), and Oxides of Nitrogen (NOx), the engine controls system uses a three-way catalytic converter. The catalyst within the converter promotes a chemical reaction which oxidizes the HC and CO present in the exhaust gas. This reaction converts them into harmless water vapor and Carbon Dioxide. The catalyst also reduces NOx, converting it to Nitrogen. The Powertrain Control Module (PCM) monitors this process using Bank 2 HO2S #2. Bank 2 HO2S #2, located in the exhaust stream past the three-way catalytic converter, produces an output signal which indicates the oxygen storage capacity of the catalyst. This determines the catalysts ability to convert exhaust emissions effectively. If the catalyst is functioning correctly, the Bank 2 HO2S #2 signal will be far less active than that produced by Bank 2 HO2S #1.
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