Circuit Description
The secondary air injection (AIR) system reduces exhaust emissions after initial engine starts. This occurs when the engine start-up coolant temperature and the intake air temperature (IAT) are at the parameters indicated in Conditions for Running. The AIR pump will continue to operate until Closed Loop operation is achieved.
The powertrain control module (PCM) activates the AIR system by simultaneously supplying a ground to the AIR pump relay and the AIR solenoid relay. The AIR pump forces pressurized fresh air into the pipes/hoses and past the AIR check valve into the bank 1 exhaust manifold, accelerating the catalyst operation. When the AIR system is inactive, the AIR shut-off valve prevents airflow in either direction.
The PCM can detect an AIR system airflow fault by monitoring the heated oxygen sensor (HO2S) bank 1 sensor 1 during normal Closed Loop engine operation. This is an active test. The active test will pass or fail based on the response from the HO2S 1. The active test consists of three tests run at 3-second intervals. A decreasing HO2S 1 voltage parameter response indicates that the AIR system is functioning properly.
The AIR system consists of the following components:
• The AIR pump
• The AIR pump relay
• The AIR injection electronic shut-off valve
• The AIR injection solenoid relay
• The fuses, and the related wiring
• The pipes/hoses
When the PCM detects an insufficient HO2S 1 response, DTC P0410 sets.
DTC P0420 Catalyst System Low Efficiency
Videos on youtube suggest you watch P0420 P0420 How To Diagnose Bad Catalytic Converter EricTheCarGuy How to test an electric air pump P0410 case study
SOURCE: 2004 lincoln ls has p0420 code c ev o oh e
If you have a 2004 lincoln ls,the PO420 is-- Catalyst System Efficiency Below Threshold. ( Bank 1) The list of possible causes are long. I have the same vehicle, and the Emissions Manual,which is several hundred dollars. Don't let anyone tell you it is a bad Converter. It may be, but it is only six years old. I would check for codes. The ignition coils (Coil-On-Plug) go bad on all Fords and a misfire, resulting overheating of exhaust system etc,will set all kinds of codes,and they may not be related, to the real issues. Lincoln is where one of everything goes,when it comes to the latest technology. Check that the O2 Sensors are screwed in tight. Later on you may need to have them checked out,if no ignition issues or malfunctioning coolant temp sensor issues. Use only 5-20 Oil. I use Mobil 1 synthetic. Hopefully your not using any,and ruining the converter. Make sure you have the system full of coolant,including the Degas container,the one where antifreeze mix goes. Remember GO5 Yellow antifreeze on ford products. Also bleed the hose next to the brake booster to let out air,in the coolant system. You can check for above normal fuel pressure. I would not go to a Dealer and spend more than necessary. Find a good shop that knows these vehicles. You can't fix every problem on all makes that come thru your doors today. Hope I give you a start on things to have checked. I would stand in the service bay by the car and have the tech prove what is wrong before I would authorize any part replacement.
SOURCE: i have a 1999 chevy
P0420 - Catalyst System Low Efficiency
P0410 - Secondary Air Injection (AIR) System
P0305 - Cylinder 5 Misfire Detected
P0449 - Evaporative Emission (EVAP) Vent Solenoid Control Circuit
i have a 1997 blazer with the 4.3 and right now i have the ecm temp sensor unplugged. this does effect the way it starts in the cold. this particular sensor is on the front of the intake in front of the thermostat housing. this also effects the shift timing as well.
SOURCE: I have a 2001 Cadillac Deville. When I got it
Did you get it scanned because you have an electrical fault ?
Sorry , these codes as meaningfull to you as me .
I am just grabbing at straws , its just that if sometimes you get fault codes for loads of different things it may turn out that its electrical , may even be a relay gone ! Grabbing at straws ,as I said.
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