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Those codes are associated with the Secondary Air Injection. I too had the same codes on my 2003 Discovery. From reading Land Rover forums online, I determined that it is likely the Secondary Air Injection Solenoid that has gone bad. It is a $20 part that you can buy on atlanticbritish.com and install yourself without any tools. The hardest part was getting the original solenoid off -- it is simply clipped on with a plastic arm that is built into the part.
Does your Secondary Air Injection come on at random times? Mine would also come on sometimes at stop lights even after the engine had already warmed up. That is another sign that you might have the same problem and need to replace the solenoid. Before I replaced the solenoid, I had turned off the check engine light and noticed it came back on immediately after the secondary air injection went off after starting the truck cold a few times. After replacing the solenoid, I have yet to see the check engine light return.
17828/P1420/005152 - Secondary Air Injection Solenoid Valve (N112): Electr. Malfunction Possible Causes
Secondary Air Injection Solenoid Valve (N112) faulty
Secondary Air Pump Relay (J299) faulty
Check Secondary Air Injection Solenoid Valve (N112)
Check Secondary Air Pump Relay (J299)
The secondary air injection pump relay (J299) is inside the engine compartment, left side, behind air cleaner housing, under a black plastic protective cover you can lift up to reveal it. It's near the brake fluid reservoir beside the odd black plastic cover for the wiring harness beside the shock absorber tower.
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That's s failure of the secondary air pump. It'll have to be changed. It's an emissions component meant to help with cold start emissions. It won't cause engine running trouble but at inspection time you'll fail for smog. Change it before then and you'll be fine.