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Car sputters n misfires, when starting or excellerating more so when the a/c running. Rpms drop to zero sometime when driving. Replaced the fuel filter, fuel pump running fine, replace some damaged flex tubing in the exhaust, also does not have a cat. Anymore these are the most recent errors was reading one on the catalist warm up..

Vehicle: 2000 hyundai sonata 4liter
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1 Answer

The two codes may not be related since one is for the transmission and the other one for the engine. The P0300 code is triggered when the engine is misfiring. Misfiring problem can be caused by a range of components, spark plugs, injectors or coils. You should start by replacing the spark plugs.

P0705 HYUNDAI - Transaxle Range Signal Malfunction

Read More: https://www.autocodes.com/p0705_hyundai.html

P0300 HYUNDAI - Random/Multiple Cylinder Misfire Detected

Read More: https://www.autocodes.com/p0300_hyundai.html

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