macaloon Posted January 16, 2010 Report Share Posted January 16, 2010 Hi all,my check light came on yesterday and I got it scanned by a mate at his garage and the fault codes which came up are:17559 - fuel trim lean 16786 - egr flow excessive he seems to think it could be a small air leak, anyone have any ideas ??i had the front lambda sensor changed a few months back if that matters any assistance would be appreciated! Quote Link to comment Share on other sites More sharing options...
CasperGTI Posted January 16, 2010 Report Share Posted January 16, 2010 (edited) This is whats related to the first code, not much help. but gives you an idea. 17559/P1151/004433 - Long Term Fuel Trim Additive Air; Bank 1; Range 1: System too Lean Possible Symptoms Malfunction Indicator Lamp (MIL) active Possible Causes Intake System faulty/leaking Fuel Pressure, Fuel Pressure Regulator and Fuel Pump faulty Fuel Injectors faulty/leaking Exhaust System faulty/leaking Activated-Charcoal Filter/System faulty/leaking Secondary Air Injection System faulty/leaking Lambda/Oxygen Sensor(s) before Catalytic Converter faulty Lambda/Oxygen Sensor(s) after Catalytic Converter faulty Possible Solutions Check Intake System for Leaks Check Fuel Pressure, Fuel Pressure Regulator and Fuel Pump Check Fuel Injectors Check Exhaust System for Leaks Check Activated-Charcoal Filter/System Check Secondary Air Injection System Check Lambda/Oxygen Sensor(s) before Catalytic Converter Check Lambda/Oxygen Sensor(s) after Catalytic ConverterSecond is this: 16786/P0402/001026 - Exhaust Gas Recirculation (EGR): Excessive Flow Possible Symptoms Malfunction Indicator Light (MIL) ON Reduced Exhaust Gas Recirculation (EGR) Reduced Power Output/Engine running rough Increased Emissions <a name="Possible_Causes"> Possible Causes Exhaust Gas Recirculation (EGR) Valve stuck open/leaking/faulty Exhaust Gas Recirculation (EGR) System leaking/faulty Wiring and/or Connector(s) from/to Exhaust Gas Recirculation (EGR) Valve faulty Possible Solutions Check/Clean Exhaust Gas Recirculation (EGR) System Check/Replace Exhaust Gas Recirculation (EGR) Valve Check Wiring and/or Connector(s) from/to Exhaust Gas Recirculation (EGR) Valve Edited January 16, 2010 by CasperGTI Quote Link to comment Share on other sites More sharing options...
macaloon Posted January 16, 2010 Author Report Share Posted January 16, 2010 (edited) nice1 casper very informative as ever!! how would you approach this?i dont wanna just start replacing parts for the sake of itis there anyway to tell for example of of the sensors have gone?i know when my lambda sensor went the diagnostics print out said faulty front lambda sensor needs replacing or something similar.... Edited January 16, 2010 by macaloon Quote Link to comment Share on other sites More sharing options...
CasperGTI Posted January 16, 2010 Report Share Posted January 16, 2010 System too lean could be caused by an air leak between the TB and the head, so could be a pipe or gasket that has perished. Also, can be caused by a dead charcoal cannister.Its difficult to pinpoint it really unless you have the diagnostic software to interogate it a bit more.Id just work through the list, And i am also confused about the egr one, i didnt think the sport had it? There should be a valve on the exhaust manifold if it does have it. If it does, take it out and clean out the valve, and pop it back in. Get the faults clered and see if it comes back.The cold winter weather does to strange things to cars, take the alfa for example... leave that in the cold/snow for a week and nearly every fault light will come on when you start it, settles down after about an hour of running and the lights go out!John Quote Link to comment Share on other sites More sharing options...
CasperGTI Posted January 16, 2010 Report Share Posted January 16, 2010 BTW: from the first list, i think the secondary air injection mabe points towards EGR, mabe the two are linked..Whats your engine code and car year? ill check it out for yoJohn Quote Link to comment Share on other sites More sharing options...
macaloon Posted January 16, 2010 Author Report Share Posted January 16, 2010 i think its aub and its 2001 thanks very helpful Quote Link to comment Share on other sites More sharing options...
CasperGTI Posted January 16, 2010 Report Share Posted January 16, 2010 Ok yeah you do have an egr valve.Id remove it and clean out the valve to start off with, id think they might be related.A stuck open egr valve would cause the system to run lean. As it supplies the exhaust gas straight in to the inlet manifold, So in theory if its stuck open then it willcauls it to lean out.John Quote Link to comment Share on other sites More sharing options...
macaloon Posted January 16, 2010 Author Report Share Posted January 16, 2010 Ok I'm gunna leave it at the moment due to funds being low till payday and il get my mate to look at it I may even put it in to vw to see if they can sort it may cost me an arm and a leg thought lol it will be safe to drive for a few weeks won't it ?thanks for the advice john excellent as ever p.s your new wheels are beyond sickil let you know the outcome Andy Quote Link to comment Share on other sites More sharing options...
CasperGTI Posted January 16, 2010 Report Share Posted January 16, 2010 Cheers dude, glad you like them!All you need to do is unbolt it and clean it with carb cleaner, or some thinners.Start off with the cheap things that wont cost you anything.John Quote Link to comment Share on other sites More sharing options...
macaloon Posted January 28, 2010 Author Report Share Posted January 28, 2010 just so everyone knows cleaned the EGR valve cleared the fault and all seems well touch wood..... Quote Link to comment Share on other sites More sharing options...
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