Review Of Common Check Engine Light Codes References. Each code in the list corresponds to a specific issue or malfunction. It’s used to verify that the light itself is working and the bulb is not burned out.
Web modern vehicles have onboard diagnostic computers built into their system, which contains a 5 letter diagnostic trouble code (dtc) when the check engine light appears. Web the check engine light can behave in different ways. Reconnect the negative cable and tighten it up again using your wrench.
