Code p1540 I have error codes P0500, P1101, P1121, and P1540. will any of these cause engine to stall out? What exactly is a Vehicle Speed Sensor Malfunction 2?

The codes tell the issue

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A P0500 code is a diagnostic trouble code (DTC) titled "Vehicle Speed Sensor (VSS) Malfunction." This code is triggered when the vehicle's Powertrain Control Module (PCM) or Engine Control Module (ECM) detects inaccurate speed readings or lack of a signal from the Vehicle Speed Sensor (VSS).

p0500 Code - Vehicle Speed Sensor "A" ' KBB

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The P0500 code indicates a problems with the ABS system. If you have recently replaced wheel sensors, it sounds like one or more may be disconnected or flaky.

From datsc.com:
What does this mean? OBD Code P0500refers to
Basically this means that the vehicle's speed as read by the Vehicle Speed Sensor (VSS) is not working properly.
Symptoms Possible sumptoms of OBD code P0500
loss of anti-lock brakes the "anti-lock" or "brake" warning lamps on the dash may be lit the speedometer or odometer may not work properly (or at all) your vehicle's RPM limiter may be decreased the shifting of an automatic transmission may become erratic other symptoms may also be present
Causes Possible causes of OBD code P0500
A code P0500 may mean that one or more of the following has happened: The Vehicle Speed Sensor (VSS) is not reading (functioning) properly There is a broken/frayed wire leading to the vehicle speed sensor The vehicle's PCM is not correctly configured for the actual tire size on the vehicle
Possible Solutions The simplest thing to do is to reset the code and see if it comes back. Next, check all wiring and connectors that lead to the speed sensor. The location of the sensor depends on your vehicle. The sensor could be on the rear axle, transmission, or perhaps the wheel hub (brake) assembly. If the wiring and connectors are OK, then check the voltage at the speed sensor. Again, the exact procedure will depend on your make and model of vehicle. If everything looks OK, replace the sensor.

P1540 Subaru Vehicle Speed Sensor Malfunction P1101 Subaru Neutral Position Switch Circuit High Input

EOBD II Error Code: P0117
Fault Location:
Engine Coolant Temperature (ECT) Sensor (G62) - Low Input
Possible Cause:
Malfunction Indicator Lamp (MIL) Triggered on first occurrence.
Coolant thermostat.
Wiring short to earth.
Engine coolant temperature (ECT) sensor.

EOBD II Error Code: P0340
Fault Location:
Camshaft Position (CMP) Sensor A (G40), Bank 1 - Circuit Malfunction
Possible Cause:
Malfunction Indicator Lamp (MIL) active.
Wiring from/to Camshaft Position Sensor (CMP) faulty.
Camshaft position (CMP) sensor faulty.
Timing misaligned.
Possible Solutions:
Check Wiring from/to Camshaft Position Sensor.
Check Camshaft Position Sensor.
Check Timing.

EOBD II Error Code: P0500
Fault Location:
Vehicle Speed Sensor (VSS) - Circuit Malfunction
Possible Cause:
Malfunction Indicator Lamp (MIL) Non Emission Fault - No warning light.
Wiring.
Vehicle speed sensor (VSS).
Engine control module (ECM).

Error Code: P0500
Fault :
Vehicle Speed Sensor (VSS) - Circuit Malfunction
Possible Cause:
1. Wiring harness.
2. Vehicle speed sensor (VSS).
3. Engine control module (ECM).
4. Combination meter.

PO407 = Exhaust Gas Recirculation Flow (EGR)
P1540 = Air bypass valve circuit malfunction

Your code is for a fault in the EVAP purge sloenoid system.

The smoke and moisture out the tail pipe is normal. The purge solenoid may be stuck open causing fuel vapors to enter the engine on cold start. This will give you a rich fuel smell. The engine normally runs rich on cold start up.

The EVAP purge solenoid is a common failure. Here is a diagnosis pinpoint test to perform on the EVAP system for your fault code. The first thing would be replace the gas cap, or a possible defective Evaporative Emission Canister Vent Solenoid, ( Click Here for Instructions ) if problem persists you will need a good smoke machine to properly diagnose.

Hope this helps.

Take it to a Autozone parts store or a large parts store and have them hook up their hand held analyzer and read those codes. they will then give you a printout of what they mean. All for free. take care, and good luck

p500=Vehicle Speed Sensor Malfunction (VSS)
p1540=VSS Signal Too High
P1507= Vehicle speed/Idle Speed Actuator
Speed sensor is faulty or has a bad connection.

P1540 VSS(vehicle speed sensor) signal to high, P0500 vehicle speed sensor malfunction.