I read this on another Rover site and copied it for all to read. Has anyone heard about this recall?
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LAND ROVER OWNERS:

B167 Emissions Recall Action -- On-Board Diagnostic System Program Update

Vehicles Affected: Discovery Series II Model Year 2001 through 2004 (1A288065 to 4A864382)

Dear Land Rover Owner,
Land Rover North America and the California Air Resources Board have determines that the On Board Diagnostic (OBD) system calibration on your vehicle will not properly identify a problem with the fuel tank leak detection module ("Leak Detection Module"), if one should occur.

Land Rover is therefore implementing this Emissions Recall Action on all Discovery models that may exhibit the emissions system faults described below. Your vehicle is included in this recall action.

Recall "On-Board Diagnostic System Program Update"
The OBD system is deisnged to signal the owdner when it detects a malfuntion in some part of the vehicle emissions control system by illuminating the SERVICE ENGINE SOON light on the instrument panel. Land Rover has determined that certain 01 through 04 Discovery Series II vehicels will not correctly diagnose certain malfuntions with the Leak Detection Module.

What is the problem?
On vehicles affected by this condition, the OBD computer software will not store a fault, not illuminate the SERVICE ENGINE SOON light
alerting the driver to malfuntions of the Leak Detection Module. Whne this condition occurs, your vehical cannont detect air pollutant leakage, which may exceed California standards. These standards were established to protect your health and welfare from the dangers of air pollution.

What will Land Rover and your Land Rover retailer do?
In order to remedy this situation, Land Rover is conduction and Emissions Recall Campaign. An authorized Land Rover Retailer will perfrom the required repair actions free-of-charge for parts and labor.
What should you do?
Please contact your authorized Land Rover Retailer to schedule and appointment to havge this work completed on your vehicle at your earliest convenience. This work will be carried out free-of-charge. When you contact the retailer, inform them of the need to have Recall Action B167 cpmpleted on your vehicle. Your authorized Land Rover Retailer will install the updated software to the ECM in your vehicle.

In order to ensure your full protection unter the emission warranty applicable to your vehicle, it is recommeneded that you have your vehicle serviced as soon as possible. It is importatn that the diagnostic software in your vehicle be corrected promptly, otherwise, your vehicle could fail a state or local emissions inspection.

How long will it take?
The complete repair should take approximately 30 minutes. However, due to service scheduling requirements at the Retailer, your vehicle may be needed for a longer period of time. Please contact your authorized retailer to schedule and appointment. There is no impact on driveablity or vehicle functionality.

 

I took my '01 Disco in for this recall yesterday because my California DMV Renewal is requiring a “Proof of Correction Certificate�. When I left the dealer, I noticed a slight pre-ignition knock. But I didn’t think much of it. But this morning, upon takeoff it had the worst pre-ignition knock! I stopped immediately, let it warm up a little, and it went back to the slight knock.
I always use 91 octane – it’s the hightest we get in California.
Anyone else with pre-ignition knock issues after this “emissions fix�?

 

Thanks for the info. Quite interesting.

 

i do have that knocking noise, yet i just bought this 01 DII a little over a month ago. i am concerned. bad thing is the dealership i bought it from did not supply me with any previous maintenance information. its apparent they took excellent care of it, took it to a local mechanic for personal inspection and he was impressed. my appt is 3 weeks away with the dealer.

 

So how many miles on the truck, do you hrear the knock all the time or just when the engine is cold and it goes away when hot???
Mike

 

56K on the truck, and yeah, it goes right away when it warms up a little. It's a little worse now that it's winter and getting colder out.

 

You sure you are not hearing a little engine noise? May be time to flush the engine.
Mike