Land Rover Repair: codes P0150,P0174,P1174, mass air flow sensor, mass air flow

Question
Hi Jonh, I took my 2003 discovery for valve cover gasket replacement about 4 months ago, few weeks after my service engine soon light came on took it back to the same mechanic and he told me that the 02 sensors on bank 2 needed replacement. After 1 month light was back on and same mechanic told me that mass air flow sensor and the 02 sensors on bank 1 needed replacement, now 2 months after light is on again, this time I took it to land rover and they told me I had a bad purge valve which I replace but still didn't solve the problem. I was getting this 4 codes P0440,P0150,P0174,P1174 after I replaced purge valve and cleared all 4 faults only 3 came back after a drive cycle. P0150,P0174,P1174. Any ideas. What should I do or replace now.  

Answer
You may not like hearing this, but I suggest you find a qualified shop to look at your truck and see what's going on.  You're spending a lot of money on guesses.

Go to www.rangerovers.net and look at their list of shops.

Go to my web site, www.robisonservice.com and look at service > land rover > advice > robison on rovers to find my magazine article on choosing a repair shop.

You've got to find a properly skilled and equipped repair facility.

Good luck!!