OOPS, I just noticed the MPG went from 26 MPG to 32 MPG after replacing=20 the O2 sensor. And I had chased that for some miles, at first it was=20 intermittent. It's really almost impossible to troubleshoot these modern=20 vehicles without the system OBDII data. Around here many, not all auto=20 parts stores will scan your vehicle for free, hoping you will buy the=20 necessary parts there. On 2/8/13 7:19 PM, Oli Glaser wrote: > On Fri, Feb 8, 2013 at 4:15 PM, Carl Denk wrote: > >> If you can find, probably the manufacturer (Renault) has an emissions >> manual thatcould be several inches thick. I have the ones for our Fords >> and they are very valuable for troubleshooting. There are symptom >> charts, scan code charts with many layers of tests to lead to specific >> components, pin-outs and normal values of voltages, resistances, just to >> mention a small part of the info. The full set of manuals body, chassis, >> power train and emissions can cost around $350. For most USA cars they >> are available from Helm Inc. in Detroit. >> >> >> I have and highly recommend the Scantool with the Pro package for the >> particular year/model. Mine is bluetooth to a laptop, saves considerable >> info for review at home. Was able to find aslightly out of tolerance O2 >> sensor, that kept the fuel control from going closed loop. After >> replacing the sensor fuel mileage went from 36 mpg to 32 mpg for same >> driving. >> >> > Hi Carl, > > Thanks for the tip, will have a look around for such a manual for the > Renault. We only have the Haynes manual here, which covers all the > mechanical side of things in great detail (essentially how to strip the c= ar > down and rebuild if necessary - Haynes have been providing these excellen= t > manuals for over 50 years now - http://en.wikipedia.org/wiki/Haynes_Manua= l) > but unfortunately the electronics detail is limited to a simple wiring > diagram. > I had a look at the Scantool site, and have bookmarked it for future > purchase if necessary. > > Thanks, > Oli --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .