Questioni took my 99 II to the dealer today because my engine light stay on i was told that it was my o2 sensor with the MAFF? sensor( up by the air filter box) In was told it would cost around $800.00. I told them that 2 weeks back i change all 4 sensor (bosch) with the MAFF? sensor.I refused to have the work done. as im driving home the light turn on. I was given my my bill in wish it show that multiple stored faults..p1590, po174, p0171, p0150.Please HELP. I LOVE my LR2, I don't want to sell it an i have no trust WITH MY LR DEALER. im good working around cars.......HELP THANK YOU
Answerp1590 indicates a problem in the rough road signal, a signal passed from the antilock brake controller to the engine controller.
I doubt if you can do much to sort this code out without the specialized Land Rover test systems like the Autologic or T4.
P0174 means bank B is running too lean
P0171 means bank A is running too lean
Those two codes together often indicate a failing mass air sensor, as the dealer told you. They could also indicate a vacuum leak or other problem. The readings could also indicate you put the wrong oxygen sensors in the vehicle, if you just changed them.
P0150 means there is a problem in one of your oxygen sensor heater circuits.
The T4 Land Rover test system has some good tools to test these citcuits. You may be able to resolve whatever sensor or wiring problem you have with a meter but I doubt it.
Good luck!
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John
