Most Volvo petrol AMM's I've tested/saved are all 3.9 - 4.05 volts max.
I've never seen an intermittant AMM fault, its either faulty or not.
Emissions are pointless for this as you'll be taking readings when there is no fault.
This needs tested when the fault occures, what is the front 02 sensor reading and the fuel flow (pressure is only half a test)when the fault occures?
Regards
Sean
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