P0102 = MAF or VAF A Circuit low input
your mass air flow senser has low frequency (replace it)
I believe it is a input speed sensor. Hyundai calls them pulse generators on the 99 elantra.
The firing order on a 1999 Elantra is 1,3,4,2
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Trouble code P0136 means: O2 Circuit (Bank 1, Sensor 2)
Trouble code P1624 means: Cooling Fan Relay Circuit Malfunction, Low Circuit
Look at wiring on MAF sensor (air intake) You're lucky-it's a cheap one.
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Code PO102 is referring to the mass air flow sensor. The maf sensor tells the computer how much air is being taken ino the engine so it will know how much fuel is required. You need to check for any vacuum leaks or loose clamps on the air intake hose.
1461
In the fuel tank
The Code P0340 on your Elantra means:Camshaft position sensor circuit malfunction