Question about Land Rover Freelander

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I have problem with my car rover 75 2.0 V6 2002.i live in UK.when i start engine the engine stalls and sometimes dies.this only happens when engine is cold.when warms up it's running ok.i already write to you guys and you said it could be Mass airflow sensor MAF,but i replaced it and still the same problem.anyway i got car fault reader and when i plug it in it reads two faults 1.O2 sensor curcuit low volts 2.Catalyst effinciency below treshold is there anything i could do.thanks for all your help

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  • Marek Andrascik Sep 09, 2010

    hi it's p131,p420 and p300

  • Marek Andrascik Sep 11, 2010

    it was helpful thanks



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I recently hear a problem that looks much like yours. It was with a '01 Disco and they too was getting 02 sensor failure codes. Turns out that the sensors were not installed properly.

Here are some other possible causes and possibilities: Failure of the closed loop control of the exhaust emission system may be attributable to one of the failure modes indicated below:
1. Mechanical fitting & integrity of the sensor.
2. Sensor open circuit / disconnected.
3. Short circuit to vehicle supply or ground.
4. Lambda ratio outside operating band.
5. Crossed sensors.
6. Contamination from leaded fuel or other sources.
7. Change in sensor characteristic.
8. Harness damage.
9. Air leak into exhaust system (cracked pipe / weld or loose fixings).

If you know what codes are being triggered, send them along and I'll try to help, while could check this:
- DTC_P0133
- DTC_P0141

I hope this helps.

Posted on Sep 09, 2010

  • ZJ Limited
    ZJ Limited Sep 09, 2010

    P0131 - Oxygen O2 Sensor Circuit Low Voltage (Bank 1, Sensor 1)
    Causes: A code P0131 may mean that one or more of the following has happened:

    * Faulty o2 oxygen sensor
    * Short to voltage on O2 signal circuit
    * High resistance or open on O2 signal circuit
    Possible Solutions:
    * Replace faulty sensor
    * Repair short, open, or high resistance on o2 signal circuit

    P0420 - Catalyst System Efficiency Below Threshold (Bank 1)
    The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.

    Causes: A code P0420 may mean that one or more of the following has happened:
    * Leaded fuel was used where unleaded was called for
    * An oxygen sensor is not reading (functioning) properly
    * The engine coolant temperature sensor is not working properly
    * Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe
    * Retarded spark timing
    * The oxygen sensors in front and behind the converter are reporting too similar of readings

    Possible Solutions: some suggested steps for troubleshooting a P0420 error code include:
    * Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
    * Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
    * Inspect the downstream heated oxygen sensor (HO2), replace if necessary
    * Replace the catalytic converter

    One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.

    P0300 - Random/Multiple Cylinder Misfire Detected
    Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly.

    Causes: A code P0300 may mean that one or more of the following has happened:
    * Faulty spark plugs or wires
    * Faulty coil (pack)
    * Faulty oxygen sensor(s)
    * Faulty fuel injector(s)
    * Burned exhaust valve
    * Faulty catalytic converter(s)
    * Stuck/blocked EGR valve / passages
    * Faulty camshaft position sensor
    * Defective computer

    Possible Solutions:
    - If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
    - If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

    Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

    Review it.



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SOURCE: dear fixya i have problem

How many miles are on the vehicle? It sounds like you need to change the 02 sensors/check the wiring first and go from there.
Thank you,

Posted on Aug 27, 2010

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