my golf 2.8 v6 4motion is coming up with this code P1129Long Term Fuel Trim B2 System Too Rich can anyone help why?
I think it's saying that B2 (bank 2?) (guessing this is 2 separate exhaust manifolds each with O2 sensors and catalysts?) has reached the lower trim limit. Fuelling has been reduced by x amount but system still reading rich (too much fuel)
Is the engine modified at all? just got to think what would cause sensor to read high damaged sensor, leaky injector, misfire, something affecting air flow, variable intake not operating?
thats right but you have 4 O2 sensors two on each bank one per cat and one post cat i would think this is one of the post cat O2 sensors but dont quote me on it it could be a number of things air leak after the maf /O2 sensor or it's the wiring/maf i think i would look for any air leaks first check the vac and inlet hose and the inlet manifold joint
17607 = P1199 O2 Sensor Heater Circ.,Bank2-Sensor2 Electrical Malfunction The heater element in your Bank2 O2 sensor is faulty, This affects the readings from this sensor, and could be the cause of the other fault (17537 P1129Long Term Fuel Trim B2 System Too Rich) Bank 2, pre-cat sensor
are you sure that is pre cat as Sensor2 is post cat and Sensor1 is pre cat is it not if it was the per cat sensor1 you would get 17511/P1103 Oxygen Lambda Sensor Heating B1 S1 Performance too Low 17516 P1108 Oxygen Lambda Sensor Heating B2 S1 Performance too Low i am no expert but that's how i see it
I copied and pasted that without even reading it said the sensor number whoops! I agree with Mushy, tis post cat sensor highlighted in the trouble codes. You can't fix the heater as it's inside the sensor. new sensor will be 60-ish I suppose as the code description isn't ultra specific, it could be worth checking the wiring from the sensor back, just incase theres something obvious like its got caught on something or touched the exhaust, else, replace it.
[FONT=Arial,Helvetica][SIZE=+1]17537 P1129 Long Term Fuel Trim mult.,Bank2 System too Rich [/SIZE][/FONT] [FONT=Arial,Helvetica][SIZE=+1]17607 P1199 O2 Sensor Heater Circ.,Bank2-Sensor2 Electrical Malfunction [/SIZE][/FONT] not sure what am i looking for? or where it is? is it the bambder prob?
yes its still the lambda probes and it looks like the two post cat lambda's from the codes you posted as said if the heater is gone thats it the 4motion has 4 lambda probes in all you lucky the post cat one are easy to get at the per cat ones have just gone on mine and they are a pig to change you are looking at 70-101 each vw are 101.62 plus vat
just found universal lambda sensor for seat leon 2.8 and vw, golfs, boras, replaces bosch 0258006302 vw 022 906 262 l this lambda sensor fits after cat/ post cat/ downstream and they are 30 each
Ask for lambda probes 022906262L. These are the CMS or post cat sensors. Get OE ones, the ECU does not like sending the wrong current to pattern heater circuits!
