p3214 - 004 - heater return coupling - intermittent
Dear Folks,
While diagnosing my intermittant cylinder misfire on Cylinder 9. I am getting the fault code; p3214 - 004 - heater return coupling - intermittent.
Please let me know if this is a fault with that Lambda sensor or the effect of some other fault?
Looking forward to any guidance you can offer.
Kind regards,
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Present cars
Daily driver: BMW e65 730d
Batmobile: 2006 S8, D3, 4E 5.2L V10 BSM with (loud) Miltek SS exhaust, Carbon Fibre trim, Alcantara headlining, soft close and keyless entry. 
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