Aug 082010
 

hi we have a 1999 dodge grand caravan 3 literthe serpentine belt went while driving home we drove it about 5 km before quit we put a new belt on and new spark plugs the van will start but won’t turn over we have an OBDII code # P2000 can you tell me what that means or what we can do to fix it

  One Response to “Van won’t start – Engine Code P2000”

  1. P2000 NOx Trap Efficiency Below Threshold (Bank 1)

    This code usually indicates a faulty oxygen sensor(s). However, in some instances it can also be used for a faulty catalytic converter as well, since the O2 sensors are located on the exhaust system along with the cat. converter(s). You should check your O2 sensors before replacing the catalytic converter. Here is a guide on checking these sensors.

    All engines run on a optimum fuel to air mixture called “stokiometric” which means chemically balanced. This balanced fuel to air ratio is 14.7 to 1, 14.7 parts air to 1 part fuel. The oxygen sensor is created using the active chemical such as zirconium, electrochemical (also known as Galvanic), infrared, ultrasonic and very recently laser. When a lean mixture code is detected by you or a technician the first tendency is to replace the oxygen sensor. The best way to check the operation of the sensor is to run a simple test. No matter if your engines oxygen sensor has one wire or four there is only one sensing wire that feedbacks information to the PCM. To find this wire you will need a car repair manual. If a trouble code is present that pertains to a oxygen heater sensor failure, replace the sensor to repair the problem. A oxygen sensor must be warm before it will operate properly.

    Warning: If a malfunction exists with related components such as an engine misfire or engine vacuum leak do not perform this test. The oxygen sensor to designed to operate within a particular range, if this range is exceeded the sensor will give the appearance that it has failed.

    SENSOR TEST PROCEDURE—

    •Step 1 – Once the oxygen sensor sensing wire has been located connect a volt meter to the feedback wire and ground. Select the millivolt operation on the meter.

    •Step 2 – Next, start and run the engine at idle until warm (about 15 minutes). Observe the voltmeter, it should bounce slightly at whatever voltage the sensor is centered at (about 150 millivolts).

    •Step 3 – Continue to observe the meter and have a helper rap the throttle. The meter should drop for a split second as the mixture leans out in the first milliseconds of the throttle bore being opened. Then quickly rise for a spit second as the throttle closes and the mixture richens. The volt meter should stabilize at the original operating voltage when the engine returns to idle.
    Remember, if the sensor fails this test, replace it but if it passes, replace the Catalytic converter…

 Leave a Reply