Question about Land Rover Cars & Trucks

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I have a 2005 range rover that had check engine light on . I hooked up obd and got code p2a00 which was 02 sensor circuit range/performance bank 1 sensor 1. I had changed the passenger side front first and nothing changed. I was told that bank 1 sensor 1 is the driver side, so i ordered another front sensor and changed that one. Nothing changed. I noticed that when i start the truck in the morning is sounds great ,but a minute later it sounds and runs horrible.Any suggestions what else to check. Thanks Moe

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  • Land Rover Master
  • 822 Answers

With a defective O2 Bank 1 front sensor you would expect a poor warm engine running operation.

The before catalytic O2 sensor controls the fueling function to the engine. The mixture air/fuel ratio is calculated from the input from this critical sensor.

With a simple scan tool with graphic function the operation of this O2 can be observed, and diagnosed.

Suggest borrow or if car drive-able take to a parts store that will perform a complementary scan of the O2 function.

These are heated sensors and the heated circuit electrical connection could be the problem.. Exhaust leak, blocked catalytic converter, broken wire are all possible causes. By graphing the function and comparing to bank 2 diagnostics are relatively easy.

The reason at cold startup the engine is OK is that until the O2 heats up the engine is running open loop and the O2 is not hot. To be operational the O2 must be hot.


Hope this helps?

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Posted on May 18, 2017

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 99 Answers

SOURCE: Check engine light comes on. p0171 and p0351 codes found

From Lusty Kid:

I know the economy is bad, but change all of the plugs. Check your PCV Valve hose, 150 rottens them out allowing air to be sucked in, thus all kinds of codes.

Depending on mileage. Dismount the EGR valve and clean passages. If you are really good dismount the throtle position sensor body and clean out passages with Choke Cleaner., dismount where the EGR valves connects to the engine, clean out passages. Also check the hose thats behind this mounting to ensure is not clogged. If clogged clean it out. If not replace it. Is about 1.5 ft. long, connects to the PCV Valve Hose.

When is the last time you change your harness. Can't remember??? Replace it. Good Luck

Posted on Dec 26, 2008

  • 3 Answers

SOURCE: Engine Error Codes P0353, P0113, P0133, P0551, P0171

I would disconnect the battery for about 3 mins. Then drive it around tell the light comes on and then check the codes again by cycling the key 3 times. Have you put new plugs in? I have replaced my plugs 4 times tell I relized Dodge durango 4.7 and Magnums do not like platnium plugs. They will miss almost from the first time putting them in. Then I would go to Cylinder 3 and look at the plug. For the most part its either plugs on the left bank or Coils. all you have to do is pull the coil put the plug from that cylinder in the coil and ground the electrode out. If it sparks the coil is working if not then change the plug if it still dosnt you have a bad coil. The power steering switch is somthing way diffrent. The o2 sensor smells the gas and tells the computer wether its needs to back off on fuel or put in more. So if thats bad youll lose about 2 miles per gallon if you need more help go to http://www.dodgetalk.com/forums
They have always helped me or email me at frizzell3333@q.com I hope this helps.

Posted on Apr 05, 2009

juggernautxt
  • 145 Answers

SOURCE: Code: P0133 - O2 Sensor Circuit Slow Response Bank 1 Sensor 1

is this a 4 or 6 cylinder?
if a 4 cylinder it will only have 2 o2 sensors
V6 will have 4 o2 senors which the sensor will be the right side of the engine first sensor.
1st sensor on exhaust, I recommend if you change one change all, as this will make the computer when it rechecks the system you have all clean/fast responding sensors.

if you have a slow response it means the sensor is dirty and not reading well, which is usually caused by minor misfires that the engine computer dismisses, so a tune up would be recommended too.

Posted on May 06, 2009

CaptainKeyz
  • 202 Answers

SOURCE: have this code PO171, what does this mean.

Not sure that the O2 sensor was bad. It sounds like it was telling you that side of the exhaust system was picking up a lean mixure at the O2 sensor. The O2 sensor was doing its job by telling you the mixture changed. If the O2 sensor was bad, it would say low voltage range for that sensor, or open curcuit.
Now the car has had time to do its diagnostic sweep, it is telling you the same thing, but from a different sensor...the fuel mix is too lean. Air/spark/and fuel is what you need in the correct amounts. In your car, the ECM engine control module controls this by taking readings from all the sensors several hundred times a second.
Mechanically, you have a few options. Change the fuel filter...under the car on the passenger side. It is an easy job.
Change the fuel pressure regulator. This keeps the fuel at 4 BAR so the fuel injectors can do their job correctly. This job just needs a screw driver to pop off the clip that holds it in place. No hoses need to be removed. It is on top of the intake manifold, in-line with a metal fuel line and a rubber one.
The fuel injectors could be clogged up on one side of the engine. Run some fuel injector cleaner through a tank of gas. Also, listen for a constant ticking sound at each injector. If one sounds off PAR, then replace it.
The fuel pump may not be giving you enough power. However, the readings seem to be localized to one side, so I doubt it.
Start with the easiest thing, and see if it works. Also, you will need to get yourself a VAG scan tool. It is the only one with codes in it for all of your VW systems, not just engine codes like the ODB scanners. You can get a nice one for $50 on-line.
Good Luck!

Posted on Feb 24, 2010

  • 370 Answers

SOURCE: OBD code P0146 O2 sensor circuit no activity. Bank

ok first off if there is no connectivity you will need to confirm this by testing the leads to the O2 sensor itself, try to back probe them with a T pin so that you don't disturb the plug too much so that you can rule out a fuilty plug connection, make sure you have voltage, I would assume this is a 4 wire O2 sensor which means that its a heated sensor meaning it has a heater in it to jump start the collection of data @ the sensor.if you have voltage check the plug it self it there is voltage on the O2 sensor side on the plug then you have a bad O2 sensor

Posted on Feb 26, 2010

Testimonial: "Thank you Dave Martin 79, your advice is very helpful to a novice do it yourselfer. I assume this sensor is post convertor or after convertor?Correct?"

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