For code p0087 replace the GDI GASOLINE DIRECT INJECTION (HIGH PRESSURE PUMP( the pump is in the top o the engine down the plastic cover- they have two gasoline lines an one electrical connector,and 2 bolts . remove return line, remove the electrical connector, loose the 19mm bolt for the main gasoline line dont move this line, remove bolts of the pump and move it away, when you work with gasoline lines is dangerous (it is at you own risk( THE CODE P0191 IS RELATED FOR FUEL RAIL PRESSURE SENSOR usually appears with p0087. symtoms of bad fuel pump: long cranking time,,erratic idle. not enough power. no start condition= pump is easy to change=
SOURCE: programming Hyundai Sonata (1999) car remotes
My dealer actually gave me the instructions on how to do it and it was a piece of cake
SOURCE: Hyundai Sonata 2006 - Check Engine light came on.
"Fuel system too lean at idle". It's an air/fuel ratio that is not correct, possibly a vacuum leak somewhere. Or a leaky exhaust pipe. Could be related to intake manifold gasket. Somewhere, air is getting into the engine.
I suggest taking it back to the dealer under warranty. I think Hyundai is 10yr./100k for the original owner. 5yr./50k if not. Ask first if covered, and ask why not id not covered.
SOURCE: check engine warning light is on 2001 hyundai sonata
Purge Control Valve Problem
The "Purge Control Solenoid Valve" is the "Purge Control Valve".
Rough
idle is a typical symptom of something amiss with the purge control
portion of the evaporative emissions system. It could be the valve
itself is not operating correctly, the evap canister (vapor canister)
may be leaking, or full of raw gas instead of vapor, or maybe even the
purge control valve is getting a faulty signal from the ECU.
The
soleniod is checked by applying a voltage to it and checking to see if
it closes, or opens (I'm not sure if its un-energized state is normally
open, or normally closed). If the valve is bad it is a no-brainer to
replace.
The vapor canister can be removed and checked to see if
it is full of raw gas (not supposed to be), but checking it for leaks is
a bit involved, and probably requires equipmet not normally owned by a
home mechanic. Vapor canister failure on cars with a lot of
miles is common. Replacement is the fix.
Of course if the ECU is
not sending a purge signal to the valve correctly, figuring out why may
proove difficult, and possibilities could even include a faulty ECU. I
expect this is unlikely though.
It's a $20 part. I first would change pcv valve because it can give same error if it's plugged up. You can always remove it and shake it. It should rattle around real easy. If not, it should be repalced
SOURCE: What is a P0105 check engine code on a 2004 Hyundai Sonata?
The code is telling you there is a problem with the MAP sensor which measures vacuum in the intake and outside air pressure.
The sensor needs to be tested and possibly replaced.
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