Try disconnecting the EHA and go for a drive. You may have a bad O2 sensor which is sending the fuel mix too rich (low %). I've got the list of fault codes (each value in 10% increments means something when engine not running) in my toolbox so I'll reply with those in 12hrs

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Alex.

MB Tech
Sydney, Australia
Volvo 122S
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W202 C240
W203 C32