Recently purchased a 2004 Discovery SE7. Had it smogged and checked out at an independent LR mechanic. Service Engine Soon lamp illuminated. light is constant, not flashing. Had codes read: P1451 and P1668
please advise
Thanks

 

didn't he tell you what was wrong or you didn't want to pay for diagnosis?

 

1668 is a engine anti-theft circuit is too high.
Pretty sure the 1451 is a fault for you secondary air injection.

 

Had it read at auto zone

 

What does it mean that the circuit is too high?


Can I still drive the car with the secondary air injection fault? Until I can get it to a shop and have it diagnosed properly?

 

Yes, you can drive with it.
As for the anti-theft issue, could get worse and not allow you to start the truck so I wouldn't depend on it for much.
Time to go see a good mechanic, not the dealer.

 

Take it back to the LR guy that checked it out. You paid him to go through the truck and now you have faults. Unless it has been a long time, see what he says.

 

My post made it sound like the light illuminated while it was being checked out at the mechanic. It didn't. It happened sometime later. Will take it to an Ind. LR mechanic to have it properly diagnosed. My husband can work on the series rover no problems. We are just trying to figure out the computerized aspects of our new child. Thanks for your insight.

Mike, I kinda figured the one code had to do with the security system cause once when I tried to start it, the alarm triggered. I may have accidentally pushed the buttons on the key fob while I was trying to start it.

As far as the Secondary Air System is concerned, I am I right in assuming that has something to do with the emission system?

Thanks for all the help!