Why do the engine and oil lights come on simultaneously and the car won't start?

[EthanAnn]

When the vehicle is turned off, these two indicator lights remain illuminated, which doesn't indicate any specific issue. If the vehicle fails to start, the following aspects should be checked: Battery voltage: Check whether the battery voltage is normal (starting voltage should be greater than 9.8V). Ignition coil inspection: Measure whether there is power supply, grounding, and signal at the ignition coil. Simultaneously, check for signal and power supply at the fuel injector (if there is no power supply, locate the corresponding fuse; if there is no signal, measure the crankshaft and camshaft sensor signals or the anti-theft system. First, use a decoder to read if there are any corresponding fault codes).