EFI231 Fault code, P0171

Madmax43 · Jun 12th, 2010, 14:52

Hi folks,

My Volvo FCR has found fault code EFI231 - Long term fuel trim part load. My OBD2 reader interprets this as fault P0171. As this fault occurs when the engine has warmed up maybe there is a fuel pressure problem?

I have no economy issues, the car goes like a rocket on rails when asked to do so by my right boot. The MAF is a new Bosch type. I have found that a pipe from the turbocharger compressor inlet routed under the dizzy lid to under the inlet manifold that seems like a bodged repair by a previous owner. As this pipe has a vacuum in it I am wondering if air is being sucked in. I performed a temporary repair until I get a new pipe ordered and also replace the dizzy lid and rotor arm (possibly causing high engine RPM misfires as they are in really rough condition) and the lambda light stayed out for a while. Back on now though!

Is there anything else I should look for?

Cheers

Martin
VOC 23739
'97 S70 T5 AUTO
'67 P1800S

Jun 12th, 2010, 14:52	#1
Madmax43 Junior Member Last Online: Dec 31st, 2018 13:07 Join Date: Mar 2010 Location: Neyland	EFI231 Fault code, P0171 Hi folks, My Volvo FCR has found fault code EFI231 - Long term fuel trim part load. My OBD2 reader interprets this as fault P0171. As this fault occurs when the engine has warmed up maybe there is a fuel pressure problem? I have no economy issues, the car goes like a rocket on rails when asked to do so by my right boot. The MAF is a new Bosch type. I have found that a pipe from the turbocharger compressor inlet routed under the dizzy lid to under the inlet manifold that seems like a bodged repair by a previous owner. As this pipe has a vacuum in it I am wondering if air is being sucked in. I performed a temporary repair until I get a new pipe ordered and also replace the dizzy lid and rotor arm (possibly causing high engine RPM misfires as they are in really rough condition) and the lambda light stayed out for a while. Back on now though! Is there anything else I should look for? Cheers Martin VOC 23739 '97 S70 T5 AUTO '67 P1800S

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