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2000 Hyundai Sonata Misfire After Washing: P0304 and P0100 OBDII Codes Explained

Model: Hyundai Fault Code: P0100 Posted: 2006-11-27 12:42

After washing my 2000 Hyundai Sonata at 80,000 miles, I noticed a misfire shortly after starting the engine. No vacuum leaks were detected, and no water was observed entering the engine. The OBDII diagnostic system shows codes P0304 (cylinder 4 misfire) and P0100 (mass air flow sensor malfunction). I'm seeking advice on potential causes and solutions for this issue, especially given the timing after a car wash.

Related fault codes
P0100P0404
Comments (2)
Anonymous 2006-11-27 12:50

Consider switching to higher-quality fuel, as poor gasoline quality can contribute to misfires and sensor inaccuracies in older vehicles like the 2000 Hyundai Sonata.

Anonymous 2006-11-27 15:17

Try drying out the ignition wires and/or coil pack, as moisture from a car wash could potentially affect electrical components and cause intermittent misfiring.