Causes and Fixes P0358 Code: Ignition Coil H Primary/Secondary Circuit Malfunction

How to fix P0358 Code: Ignition Coil H Primary/Secondary Circuit Malfunction
A P0358 Code is set when the computer (ECM/PCM) detects an issue with the primary or secondary circuit for ignition coil “H.”
Ignition Coil “H.” is on the number 8 cylinder on the engine.
The ignition coils provide high voltage to the spark plug, so at the right time, it can send out a spark that ignites the air-fuel mixture going into the cylinders.
Common causes of the P0358 code are bad ignition coil, coil wiring issues, and worn out spark plug.
Possible Causes of a P0358 Code:
Bad Ignition Coil "H"
An Issue with the Ignition Coil Circuit Wiring
Bad Spark Plug
By using this information user assumes all risk of use.

[@figgiefigueroa7372]

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[@stephennsiahasare2400]

Please I am using Toyota vitz three plugs.the spark plugs always has black smoke on the surface which consumed a lot of fuel.i have service the injector but still