Why is warning light still showing

Take to dealer for dignosis, this might be a safety issue.

P0303 Code - Cylinder #3 Misfire
P0110 DTC - IAT Circuit Malfunction
P2195 O2 Sensor Signal Biased/Stuck Lean (Bank 1 Sensor 1) Code
Potential causes of a P2195 code include:
p2195
p219521

• Oxygen (O2) or A/F ratio sensor or sensor heater malfunction
• Open or short in O2 sensor circuit (wiring, harness)
• Fuel pressure or fuel injector problem
• Faulty PCM
• Intake air or engine vacuum leaks
• Faulty fuel injector(s)
• Fuel pressure too high or too low
• PCV system leak/fault
• A/F sensor relay faulty
• MAF sensor malfunction
• ECT sensor malfunction
• Fuel pressure too low
• Fuel leak
• Air suction in air intake system
• A code P0303 may mean that one or more of the following has happened:
  

• Faulty spark plug or wire
• Faulty coil (pack)
• Faulty oxygen sensor(s)
• Faulty fuel injector
• Burned exhaust valve
• Faulty catalytic converter(s)
• Running out of fuel
• Poor compression
• Defective computer
• Potential causes of the P0110 DTC include:
  
• 
  po110
  • IAT sensor shifted out of airflow
  • Bad IAT sensor
  • Shorted to ground or open on signal circuit to IAT
  • Open in ground circuit to IAT
  • Poor connection at IAT (backed out terminals, broken connector locks, etc.)
  • Bad PCM

Do you mean p0107 ? If so that is P0107 Ford - Manifold Absolute Pressure/Barometric Pressure Sensor Low Input

Possible causes
- Faulty Manifold Absolute Pressure sensor
- Manifold Absolute Pressure harness is open or shorted
- Manifold Absolute Pressure sensor circuit poor electrical connection
- Faulty Engine Control Module (ECM) What does this mean?
When is the code detected?
The ECM has detected a performance fault with the MAP sensor
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Engine rough idle
- Engine hesitation
P0107 Ford Description
The Manifold Absolute Pressure (MAP) sensor provides instantaneous manifold pressure information to the engine's Engine Control Module (ECM). The data is used to calculate air density and determine the engine's air mass flow rate, which in turn determines the required fuel metering for optimum combustion. A fuel-injected engine may alternately use a Mass Air Flow (MAF) sensor to detect the intake airflow.

Hi,
OBD II Fault Code

• OBD II P0108

Fault Code Definition
The Manifold Absolute Pressure Sensor/Barometric Pressure Sensor measures the rise and fall of the air pressure inside the Intake Manifold. This provides critical data needed for the Power Train Control Module (PCM) to control the Air Fuel Ratio, the Ignition Spark Timing, and many components of the Emissions Control Systems. The Manifold Absolute Pressure/Barometric Pressure Sensor converts the Intake Manifold air pressure into a voltage that is high when the Intake Manifold air pressure is high and low when the Intake Manifold air pressure drops to a vacuum. The P0108 code indicates a high voltage input from the Manifold Absolute Pressure Sensor/Barometric Pressure Sensor to the Power Train Control Module.
Symptoms

• Check Engine Light will illuminate
• In many cases, no abnormal symptoms may be noticed
• In some cases, the engine may be hard starting and/or get poor fuel economy
• In some cases, noticeably poor engine performance may occur

Common Problems That Trigger the P0108 Code

• Manifold Absolute Pressure Sensor/Barometric Pressure Sensor is defective
  
• Intake Manifold vacuum leaks
• Faulty or corroded Manifold Absolute Pressure Sensor/Barometric Pressure wiring or connections

Common Misdiagnoses

• Manifold Absolute Pressure Sensor/Barometric Pressure Sensor is replaced when the real cause is an Intake Manifold vacuum leak
  
• Manifold Absolute Pressure Sensor/Barometric Pressure Sensor is replaced when the real cause is a stuck-open EGR Valve
• Manifold Absolute Pressure Sensor/Barometric Pressure Sensor is replaced when the real problem is a defective Idle Air Control Motor, which causes a very low engine idle

OBD II Fault Code

• OBD II P0106

Fault Code Definition
The Manifold Absolute Pressure Sensor/Barometric Pressure Sensor measures the rise and fall of the air pressure inside the Intake Manifold. This provides critical data needed for the Power Train Control Module (PCM) to control the Air Fuel Ratio, the Ignition Spark Timing, and many components of the Emissions Control Systems. The Manifold Absolute Pressure/Barometric Pressure Sensor P0106 code is set when there is a problematic or erratic performance in the voltage signal to the PCM.
Symptoms

• Check Engine Light will illuminate
  
• In many cases, no abnormal symptoms may be noticed
• In some cases, the engine may be hard starting and/or get poor fuel economy
• In some cases, noticeably poor engine performance may occur

Common Problems That Trigger the P0106 Code

• Manifold Absolute Pressure Sensor/Barometric Pressure Sensor is defective
  
• Intake Manifold vacuum leaks
• Faulty or corroded Manifold Absolute Pressure Sensor/Barometric Pressure wiring or connections

Common Misdiagnoses

• Manifold Absolute Pressure Sensor/Barometric Pressure Sensor is replaced when the real cause is an Intake Manifold vacuum leak
  
• Manifold Absolute Pressure Sensor/Barometric Pressure Sensor is replaced when the real cause is a stuck-open EGR Valve
• Manifold Absolute Pressure Sensor/Barometric Pressure Sensor is replaced when the real problem is a defective Idle Air Control Motor, which causes a very low engine idle

The throttle position sensor is located between the air filter box and the intake manifold. If you aren't familiar with engines, the air filter box is usually located behind the driver's side headlight. There is a rubber tunnel that runs from the air box to the intake manifold. Between the rubber tunnel and the intake manifold you will find the throttle bolted to the intake manifold. The sensor is located on the throttle.

i had the same code, p2187. check to the left of the throttle body(side facing the front of the veh.
there are 2 vaccum hoses going into the intake. the larger one on top has a spring clip holding it and if you look under that you'll see a smaller one with a check valve. mine was disconnected. plugs in under the larger one.

For replace the knock sensor on a maxima.
You need to remove the intake manifold.
If not, you have no access to the sensor.
This prosses require about 3.5 hour labor.