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Brake pedal switch is a switch mounted just above the brake pedal under the dash, not a sensor as such but if mis-aligned it will throw up the three fault LED's you list.
Engine management wont have anything to do with CAT back system as there's no sensors after the CAT. It could be anything really, possibly a sensor elsewhere or a simple loose wire.
Engine management wont have anything to do with CAT back system as there's no sensors after the CAT. It could be anything really, possibly a sensor elsewhere or a simple loose wire.