May 162011
 

I have a 2000 Grand Cherokee Jeep 2WD.  I had my “check engine light” looked at by a car repair shop. They told me that I had an Evap code of P0043.  The mechanic said that the price would be around $300 to replace canisters, etc. Is this a good price? and what are the problems that this could cause with my car if it is not taken care of?

  One Response to “2000 Grand Cherokee Jeep Evap code”

  1. $300 for the O2 Sensor is a bit steep.. but as far as what happens if you do nothing, the good news is, nothing. The light will just be on. This o2 sensor just moniters the function of the Catalytic converter and has no bearing on fuel mileage or driveability of the vehicle and is only on there because our government says it has to be. You can drive it forever with out this particular part being replaced.

    P0043 HO2S Heater Control Circuit Low Bank 1 Sensor 3
    Symptoms

    – Engine Light ON (or Service Engine Soon Warning Light)

    Possible causes

    – Heated Oxygen Sensor (H2OS) Bank 1 Sensor 3 circuit open shorted to ground
    – Heated Oxygen Sensor (H2OS) Bank 1 Sensor 3 circuit poor electrical connection
    – Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 3 circuit
    – Heated Oxygen Sensor (H2OS) Bank 1 Sensor 3 circuit fuse
    – Faulty Engine Control Module (ECM)

    Tech notes

    The code means that there is a problem with the heater element circuit of the heated oxygen sensor. Water getting inside the heated oxygen sensor connector can caused the heated oxygen sensor fuse to blow, which is a very common problem for this type codes. Before replacing the sensor, check for the condition of the heated oxygen sensor fuse and connectors.

    HO2S Heater Control Circuit Low Bank 1 Sensor 3 is the generic definition for the P0043; however your vehicle’s manufacturer may have a different definition and information for the P0043 code.

    When is the code detected?

    The P0043 is set when the ECM detects an excessively low voltage through the heated oxygen sensor heater circuit

    P0043 Description

    Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. The faster the heated oxygen sensor reaches that temperature the faster the sensor will start sending an accurate signal to the Engine Control Module (ECM).

    In order to achieve the require temperature, a heater element is included inside the heated oxygen sensor. The ECM controls the heated oxygen sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground.

    The ECM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications.

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