Question about 2003 Land Rover Range Rover

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My 2003 range rover hse came back with a code p1107 - front heated os sensor was basically stuck. I wanted to purchase the o2 sensor from an aftermarket site but did not know the exact part I should get. They had many different length o2 sensors and I didnt want to get one too long or too short. please help. I was also told that the car has 4 sensors and upper low back and front. I need to front but is theretwo in the front or would i just need to change that one?

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Look at the left and right exhaust manifolds for your front o2 sensors they will be before your converter and to get the right one measure the wire from the sensor to the connector thats your length, also if yours has two front o2's go ahead and replace both since the front o2's do most of the work.

Posted on Jul 24, 2009

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Posted on Jan 02, 2017

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Free mechanical advice


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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1 Answer

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2 Answers

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1 Answer

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