In September 2001 I bought a 1991 Volvo 740 s/w. In December 2001 the transmission failed and I had a reconditioned transmission fitted. Recently (February 2002) the Emmisions light appeared on the dashboard. I ran a diagnostic test for the ignition which showed that the (error 214) Seed Sensor was faulty. I also ran a diagnostic on the Fuel System which showed (232) the Adaptive Lambda Control, Lean Rich, or Idle and (131) No Ignition System RPM Signal. I am aware that there is a better Speed Sensor available. I do not know where the adaptive lambda control is housed or how to test it. Also I do not know where the ingition system RPM signal is generated, but I suspect that it may be related to the speed sensor. Any Advice on how to further determine the nature ofthese problems and how to repair them would be greatly appreciated. I am relatively inexperienced with automotive Repairs.

Ben Butler

Did you erase the codes from memory, to see if they showed up again? Sometimes there are issues that crop up from time to time that are not of great concern, but they set a diagnostic code. Some of the codes don't light the check engine light, so you might have been riding with them for quite a while.

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chris herbst, five volvos.

Ben:

Try alloemvolvoparts.com for the speed sensor, just click on one of their banners here on Brickboard. The part you need is under "Engine Electrical"; they list it as a "Reference Sensor" - engine speed at flywheel, part number F6010-36889 for $31.80. As for the other problem, it sounds like it could be a fuel pressure issue. I've gotten the same 1-3-1 and 2-3-2 codes from my son-in-law's '90 244 which I believe has the same LH 2.4 FI system as your 740. We first thought that the coolant temp sensor was faulty, fooling the system into thinking the engine was always cold, causing an overly rich mixture. Turned out to be his fuel pressure regulator was pressuring up and allowing nearly full pump pressure to go to the injectors, making the car run very rich. We replaced the FPR, cleared the codes and the problem hasn't recurred in over a year. Alloem has the FPR for your car too, it's Bosch 0 280 160 294, their C3000-13006 for $36.35; although we used a $5 PAP junkyard part on his car. Can't swear that this will fix your problem, but he had the same codes and it fixed his.
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Mike W., four 240s, a 740T and a 940T, Largo, FL