99 Discovery Series II, 130k miles

Problem: Service Engine Light comes on and stays on

Question: Whatshould Ido to resolve the following trouble codes?

P0171, P0174, P1590

Note: I have already replaced thespark plugs and MAF sensor

Thanks in advance,

Calvin

 

I would start bylooking for vacuum leaks after the MAF somewhere. What kind of new MAF did you get, Bosch?

 

The new MAF sensoris a Lucas RV FDM609.

 

I've read a thread somewhere where people had bad luck with Lucas sensors. I have some codes all pointing to a bad MAF sensor, but the Lucas sensors I got did not clear them. I finally got a Bosch sensor but haven't driven it yet. Anyways, if you have those same 2 codes with the old and new sensor in, then I doubt it's your MAF.

 

99 D2 uses a Bosch MAF only, no Lucas.
The 1590 code is because of your 3 Amigos, either they are on or come and go.

 

I'm not sure who makes these aftermarket MAF sensors, but they don't say Bosch on them and a lot of people sell them. The sensor without the housing comes in a Lucas box though, my box says Lucas FDM609 as well. I have three of them and they don't seem to work.

 

Call Tony at 650-365-4145 and get one of the better prices on the correct MAF.