Question about Cars & Trucks
Active faults mid 140 Pid-173 Fmi-5
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: fault code P0421
Aicux...I had the same problem with a Mitsubishi Montero Sport. The code refers to Warm up Catalytic Converter below threshold (Bank 1) which means the two oxygen sensors before and after the cat closest to the engine are showing a variance that is outside specifications. Bank 1 is on the side of cylinder 1.
I researched and found a cause that was NOT in the list of the usual causes. Generally, this code can be caused by the following:
1 Catalytic converter defective
2 Engine Misfire or similar
3 Large vacuum leak
4 Engine oil leakage into exhaust -valve guide seals, piston rings
I have learned to always look for the simplest solution before paying big bucks for things like catalytic converters, oxygen sensors, etc. I discovered my passengers side manifold was cracked. Took off the heat shield and could see the black residue from exhaust escaping the crack. Got a used manifold from partshotlines.com for $65 and installed it. Reset the code with my OBD-II device and code hasn't returned! Problem solved.
Not sure if this is what's wrong with your, but suggest you chek the simply stuff first. Good luck.
Posted on Sep 26, 2008
THESE ARE FROM THE GM CODE DIFINITION MANUAL, U NEED TO TAKE THIS TO THE DELAER, U HAVE SOME SERIOUS PROBLEMS TO GIVE THIS MANY CODES.
P0300 - Engine Random Misfire Detected
P0441 - Evaporative Emission Control System Incorrect Purge Flow
P0705 - Trans Range Switch Circuit
P1106 - Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent High Voltage
P1133 - Heated Oxygen Sensor (HO2S) Insufficient Switching Bank 1 Sensor 1
P1441 - Evaporative Emission (EVAP) System Flow During Non-Purge
P1662 - Cruise Lamp Control Circuit
P1672 - Low Engine Oil Level Lamp Control Circuit
P1870 - Transmission Component Slipping
Posted on Mar 24, 2009
THE 445 IS THE EVAP PURGE VALVE IT MAY BE BAD BOTH 446 IS SAME VAVLE YOU NEED TO SEE IF THE HOSE ARE GOOD ON THIS VAVLE MAKE SHERE NO CRACKS IF NOT PULL HOSES AND SEE IF SOMTHING IN VAVLE ITS NEAR THE CANSTER AND THAT IS NEAR THE GAS TANK UNDER CAR PUT CHECK GAS CAP MAKE SHERE ITS TIGHT HOPE THIS HELPS
Posted on Sep 15, 2009
P0411 Secondary Air Injection System Incorrect Flow Detected
p0411 is a generic code, probably a vacume leak,vacume hose broken check this first, check the air pump turn on the car but it needs to be cold, you should hear a high pitched whine, this is the air pump running,there are 2 hoses one suction one blowing thishose should be going from the air pump to the air cleaner disconnect that and see what the volume is should be pretty strong.
But mostly you probably have a broken vacume line somewhere
Posted on Jan 28, 2010
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