Repalced O2 sensors, mass air flow sensor, and plugs error messag

Intake Air Temperature Sensor

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Specific to:
Ford Escape 2005-2008

The Intake Air Temperature (IAT) sensor is incorporated in the Mass Air Flow assembly. Refer to the Mass Air Flow (MAF) sensor.Here's a link to the mass air flow sensor.
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Make sure that the fuel pressure regulator is correct, if the regulator is leaking gas than it cause this problem, also check the fuel filter,spark plug boots, throttle position sensor and mass air flow sensor.

The O2 sensor (2 on V engines) are in the exhaust system pipes before the catalytic converter, the next sensor is the efficiency monitor for the catalytic converter system it looks like a O2 sensor but performs a much different function as far as testing goes. The codes you have follow.

P0420 - Catalyst System Efficiency Below Threshold Bank 1
What does this mean? In most cases it means the catalytic converter is worn out and that is sensed by the catalyst monitor I spoke of earlier.

P0102 - Mass or Volume Air Flow Circuit Low Input
Faulty mass air flow sensor
- Dirty mass air flow sensor (located in the air intake hose to the engine from the air cleaner)
- Dirty air filter
- Mass air flow sensor harness is open or shorted
- Mass air flow sensor electrical circuit poor connection
- Intake air leaks

P0171 JAGUAR - System Too Lean ENGINE CYLINDER Bank 1 (only "V" engines (V6,V8 etc.) have more than one bank of cylinders.

Possible causes- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection Tech notes If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replaced the air filter and clean the air flow meter. If the problem persist the front oxygen (O2) sensor may need to be replaced.

Try cleaning the Mass airflow sensor and replacing the air filter. You can buy the spray MAF sensor cleaner from any auto parts store for about $6.00, ask the parts guy how to use it.

DO YOU HAVE A SERVICE ENGINE SOON LIGHT ON? IF SO YOU WILL NEED TO HAVE IT SCANNED TO READ ANY CODES. A MAF SENSOR CAN MAKE IT RUN LIKE THAT. YOU CAN TRY TO CLEAN IT WITH CARB. SPRAY.

Inside the MAF (Mass Air Flow) sensor.

You might try plugs, wires, fuel filter, air filter & PVC valve..

check all vacuum lines and make sure there is no holes in them and also check the EGR valve and try www.autozone.com to see if they have your car listed for diagrams pictures and step by step instructions if your car is not listed then try your local library they have all the car manuals and even copy them for you

Change the the O2 senor on the catalytic convert. Its probably dead.