Question about Land Rover Freelander

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CEL "ON" Scaned vehicle found two DTC's, P1149 & P2099. Replaced both RHS O2 sensors, cleared codes test drove (short) vehicle OK. There wear no drivability problems with this vehicle. Client came back next day with CEL "ON". Scan for codes found DTC # P1149. Cleared code, test drove vehicle with "Modis" connected to review live data until CEL came on. P1149 code resulted, live data at this time showed the O2 RHS @ .990 volts. What is the cause of this problem. Technician suppect poor CAT.

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  • detech333 Oct 19, 2010

    Please review my previous inquiry. The vehicle runs well & has NO drivability concerns.


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Hi, it means a primary oxygen sensor range/performance problem. In other words, the oxygen sensor is indicating a problem with the way the engine is performing. It can be anything from a vacuum leak, a weak fuel pump, a lazy sensor, and so on. It depends more on if the car is not running right or not.

Posted on Oct 15, 2010

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Vehicle CEL is on, various codes

P0300 is a random miss fire , a vacuum leak can cause this as well as low fuel pressure ! weak fuel pump , clogged fuel filter !
DTC P0171: Fuel Trim System Lean Bank 1
DTC P0174: Fuel Trim System Lean Bank 2 These two codes are saying the PCM - engine computer is see a lean condition .
DTC P0191: Fuel Rail Pressure (FRP) Sensor Performance
Circuit/System Description
The fuel pressure sensor is located on the fuel line. The fuel pressure sensor monitors the fuel pressure in the fuel line. The fuel pump flow control module (FPCM) monitors the voltage signal from the fuel pressure sensor.

You don't say what make , model an year vehicle ! These are for GM vehicles , yours could mean something else . Except the first three , those are genaric codes , same for all makes ! So can't say what this codes are P2097, and P2099 ! Can't mean this P2097 - Post Catalyst Fuel Trim System Too Rich Bank 1
P2099 - Post Catalyst Fuel Trim System Too Rich Bank 2

Sep 03, 2016 | Cars & Trucks

1 Answer

2003 toyota matrix with code po420

You don't check O2 Sensors when cold,
they won't be operating or switching until
the computer goes into closed loop & converter
lights off at 600 degrees & continues to hopefully
around 900 to 1,100 degrees
Other than replacing a sensor, the only real
test I found of any value, is to watch switching
times on an oscilloscope
You can, as you said, look at scan tool data
Giving your vehicle is a 2003 & converters last
12 to 14 years, you know yours is worn out,doesn't
matter what the inspection gas results were & with
any codes, you should have been rejected & not tested
If you check fuel trim,you will see how well the MAF Sensor
is doing & you can't adjust fuel if the converter is not capable
of holding oxygen for the sensors to read
The front O2's get replaced on all vehicles at 100,000
when or before they slow down & fail

Jul 09, 2013 | Cars & Trucks

1 Answer

Why the codes po125 & po135 &po155 keep coming back?

Hi there:

DTC P0125 - Insufficient Coolant Temperature For Closed Loop Fuel Control

The simplest thing to do is to reset the code and see if it comes back.
If the code comes back, the problem is likely going to be the result of the above causes (faulty thermostat, faulty ECT sensor, or a low coolant level).

DTC P0135 - Oxygen O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)
DTC P0155 - 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)

A code P0135 and P0155 may mean that one or more of the following has happened:

  • O2 Heater element resistance is high
  • Internal short or open in the heater element
  • O2 heater circuit wiring high resistance
  • open or short to ground in the wiring harness

In order to solve just...
  • Repair short or open or high resistance in wiring harness or harness connectors
  • Replace oxygen sensor (cannot repair open or short that occurs internally to sensor)

  • Hopoe this helps.

    Aug 28, 2012 | 1999 Toyota Sienna

    1 Answer

    2002 Subaru Forester P0136 see P2270 P2271 intermittent idling fluctuation and acceleration hesitation

    Is the wiring good going to the O2 sensors? Maybe just look the car over and see if you have any bad grounds. They can do weird things. Could be a bad ICU.

    Jan 22, 2012 | 2002 Subaru Forester

    2 Answers

    Need to pass emissions test, dianostic test - Catalyst efficiency blow threshold (bank 1) tried to order part - now I need to know if it pre or post, left or right Oxygen sensor, can it be determined by...

    Yes it can be determined by the DTC (Data Trouble code). If the DTC is P0420 (catalyst system efficiency below threshold Bank-1) then the side of the engine with the #1 spark plug and cylinder is always Bank-1, and the O2 sensor that monitors the catalyst efficiency is usually after or (post) of the catalytic converter.

    The #1 cylinder is located at the front spark plug on the right or the passenger side of the vehicle, so Bank-1 is on the right side of the vehicle, and the O2 sensor that monitors the catalyst efficiency should be located after or (post) of the catalytic converter. It would be the post right O2 sensor.

    There is also the possibility that the catalytic converter is actually starting to fail, and if changing the O2 sensor and clearing the DTC does not solve the problem them the catalytic converter is most likely faulty.

    Aug 12, 2010 | 2002 Jaguar X-Type

    1 Answer

    Replaced both 02 sensors on 2003 honda element engine light still on drove vehicle 50 miles

    The CEL will not turn off by itself. You have several options.

    1. Take it to a dealer to clear the code, which will cost $50.00 to $100.00, depending on where you live.

    2. Purchase a code reader (Actron makes a couple of nice models for about $150.00), and you'll have it for any future needs.

    3. Find a friend who as a code reader and will let you use it.

    4. Disconnect the negative terminal of the battery for about 5 minutes. This is a ****-shoot as you can't be certain that the CEL is on because of the O2 sensor. If it was on for some other reason, the light will just come back on after you've driven a few miles. Also when you disconnet the battery, you will need to reset your radio. You should find the reset code on a sticker in your glove box.

    Jul 23, 2010 | 2003 Honda Element

    1 Answer

    2000 Subaru legacy outback 2.5L DTC P0420 code will not clear. I replaced the rear O2 sensor and the CEL is still on. I used the scan tool to clear the code but it will not clear.

    that code is saying you have a problem with that system. if you go to autozone thay can print that code out for that tells you what to check. other then that you may need to get it diagnosed by a professional

    Nov 22, 2009 | 2000 Subaru Outback

    2 Answers

    Keep getting code po420

    Before Checking a Catalytic
    Converter DTC
    Before you troubleshoot an OBD II vehicle that stores
    DTC P0420 (67) (catalyst system efficiency below
    threshold), run these quick checks:
    1. Check for a leak in the exhaust system. If you find
    one, repair it, clear the DTC, and test-drive the
    • If the DTC returns, go to step 2.
    2. Connect the PGM Tester, and test-drive the vehicle
    while an assistant monitors the voltage signal from
    the secondary oxygen sensor (HO2S S2). After the
    catalyst reaches operating temperature, the HO2S S2
    voltage should stay between 0.5 and 0.8 V at steady
    cruising speed. During deceleration, the voltage
    should be steady at 0.1 V or less.
    • If the voltage readings are OK, clear the DTC.
    • At cruising speed, if the voltage fluctuates or stays
    below 5 V, go to step 3.
    3. Measure the inlet and outlet external temperatures of
    the catalytic converter with a thermometer capable
    of reading up to 500°F.
    • If the outlet temperature is more than 100°F hotter
    than the inlet temperature, the converter is OK.
    • If the outlet temperature is less than 100°F hotter
    than the inlet temperature, replace the converter.

    Aug 28, 2009 | 2001 Honda Odyssey

    2 Answers

    PO420 DTC code on 02 Nissan 2.5 Altima

    i found out the cat bein broken up and suckin into the fudgin pinstons....good luck everyone

    Apr 14, 2009 | 2002 Nissan Altima

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