po420-430
Both these codes relate to Catalyst efficiency below threshold on banks 1+2. This is normally caused by a combustion fault. This fault may be shown due to a faulty sensor in either air imput or exhaust systems
P0171-P0174
Fuel System Too Lean (Bank 1) (Bank 2)
Symptoms
Check Engine Light will illuminate
In some cases, no adverse conditions may be noticed by the driver
In other cases, there may be performance problems, such as a lack of power on acceleration and some "coughing" or misfiring
The vehicle may have trouble idling, especially when warm or when sitting at a stoplight
Common Problems
PCM software needs to be updated
Vacuum leaks (Intake Manifold Gaskets, vacuum hoses, PCV hoses, etc.)
Mass Airflow Sensor (MAF)
Plugged Fuel Filter or weak Fuel Pump
Plugged or dirty Fuel Injectors
P1000
If the Diagnosis test Code P1000 is flagged after DTCs have been cleared, all engine management OBD diagnostic monitor drive cycles HAVE NOT BEEN COMPLETED.
Every time you start the car and go through a complete drive cycle (10,000 revolutions of the motor and the motor up to temp), it is logged. after 5 complete drive cycles, the next starting of the engine, the check engine light will go out. If a further problem is sensed by the computer, the process will repeat.
check code PO171- 174 causing the problem of all