re, golf probs
hi mate, as all of your diag trouble codes seem to be missfire probs,
(since welding your exhaust) is your new exhaust (restricting the system?)
try running the car with the exhaust disconnected,
or has the exhaust been "mig welded" (without) removing the battery lead first, (possibly damaging the cars ecu??)
check voltages etc at your ecu with multimeter using autodata etc,
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