i have a j plate 940gl.every few days if the tank is less than 1/4 full and
the reserve light is not lit the engine will cut out.it takes a few minutes
to start,and when it does the emissions light comes on .when the codes are
read they are always:- fuel (bosch)1-2-1(maf sensor signal absent or
faulty). ignition 1-4-4 (load signal from fuel injection system absent or
faulty).when the codes are cleared everything is ok  for a few days.the
local garage cleaned the contacts on the maf and i put some silicon
sealent round the plug to keep moisture out, and changed the air filter
,oil and plugs last month, but the problem still occurs.i have been told
by the garage to change the maf but thought to try here first.would
running the tank that low cause the problem?can i do any thing myself to
cure the two problems.also i think i read on a link that all volvo fuel
gagues when they read 1/2 a tank of fuel there isnt 1/2 a tank ,as other
cars would have is this correct?.