Received an engine code 0355. If the coil and spark plug have been replaced, I read it's the wiring or the ECM as the problem. Any tips on checking the wiring, please? If ECM is bad, would that reflect all
cylinders misfiring? Or does the ECM somehow isolate cylinders individually? I would prefer not to replace the ECM if I don't need to. Thanks!

 

Well in this forum for the ( IS ) model the 355 would be a bad coil. You should ask the ones for your ES model.

 

Wiring is religiously bad on these engines.
The main thing that goes bad on these ignition coil wires is the plugs themselves, which makes diagnostics pretty easy. On mine, the plugs were straight up missing, and the previous idiot just shoved the wires into the coils. Yours might be more subtle, like the clip is broken but didn't fully come off, or there's damage to the wire as it goes into the plug housing, or something of that sort.