The diagnostic socket is at the lower edge of the dashboard on the driver's side.
Exhaust gas recirculation (EGR)
Yes
expand_moreIdling speed with manual gearbox
1.4 TSI with gasoline straight-4 1.4 L 138 HP at 5600 RPM, 220 N⋅m at 1500 RPM engine (2006.7–2010.10)
630–780 rpm630–780 rpm630–780 rpm
1.4 TSI with gasoline straight-4 1.4 L 168 HP at 6000 RPM, 240 N⋅m at 1750 RPM engine (2006.7–2010.10)
630–780 rpm630–780 rpm630–780 rpm
1.6 MultiFuel with gasoline straight-4 1.6 L 101 HP engine (2008.1–2010.10)
600–850 rpm600–850 rpm600–850 rpm
2.0 TFSI with gasoline straight-4 2.0 L 168 HP at 4300 RPM, 280 N⋅m at 1700 RPM engine (2008.3–2010.10)
680–840 rpm680–840 rpm680–840 rpm
All other modifications
600–800 rpm600–800 rpm600–800 rpm
Minimum engine oil temperature at VET
176°F176°F80°C
expand_morePetrol exhaust gas values
CO content at idling speed
0–0.5 %0–0.5 %0–0.5 %
CO content at increased idling speed
0–0.2 %0–0.2 %0–0.2 %
expand_moreIncreased idling speed
1.6 MultiFuel with gasoline straight-4 1.6 L 101 HP engine (2008.1–2010.10)
2500–3000 rpm2500–3000 rpm2500–3000 rpm
2.0 TFSI with gasoline straight-4 2.0 L 168 HP at 4300 RPM, 280 N⋅m at 1700 RPM engine (2008.3–2010.10)
2500–3000 rpm2500–3000 rpm2500–3000 rpm
All other modifications
2500–2800 rpm2500–2800 rpm2500–2800 rpm
expand_moreLambda sensor design
1.4 TSI with gasoline straight-4 1.4 L 158 HP at 5800 RPM, 240 N⋅m at 1500 RPM engine (2008.7–2010.10)
wideband sensor
1.6 FSI with gasoline straight-4 1.6 L 114 HP, 155 N⋅m at 4000 RPM engine (2005.9–2010.10)
wideband sensor
1.6 MultiFuel with gasoline straight-4 1.6 L 101 HP engine (2008.1–2010.10)
wideband sensor
All other modifications
Jump type lambda sensor
Lambda value
0.97–1.03 λ0.97–1.03 λ0.97–1.03 λ
expand_morePetrol conditioning speed
1.4 TSI with gasoline straight-4 1.4 L 138 HP at 5600 RPM, 220 N⋅m at 1500 RPM engine (2006.7–2010.10)
2500–2800 rpm2500–2800 rpm2500–2800 rpm
1.4 TSI with gasoline straight-4 1.4 L 168 HP at 6000 RPM, 240 N⋅m at 1750 RPM engine (2006.7–2010.10)
2500–2800 rpm2500–2800 rpm2500–2800 rpm
1.6 FSI with gasoline straight-4 1.6 L 114 HP, 155 N⋅m at 4000 RPM engine (2005.9–2010.10)
2500–2800 rpm2500–2800 rpm2500–2800 rpm
1.6 MultiFuel with gasoline straight-4 1.6 L 101 HP engine (2008.1–2010.10)
2500–3000 rpm2500–3000 rpm2500–3000 rpm
Petrol conditioning time
120 s120 s120 s
expand_moreTest speed for lambda sensor signal
1.4 TSI with gasoline straight-4 1.4 L 158 HP at 5800 RPM, 240 N⋅m at 1500 RPM engine (2008.7–2010.10)
600–800 rpm600–800 rpm600–800 rpm
1.6 FSI with gasoline straight-4 1.6 L 114 HP, 155 N⋅m at 4000 RPM engine (2005.9–2010.10)
600–800 rpm600–800 rpm600–800 rpm
1.6 MultiFuel with gasoline straight-4 1.6 L 101 HP engine (2008.1–2010.10)
600–850 rpm600–850 rpm600–850 rpm
2.0 TFSI with gasoline straight-4 2.0 L 168 HP at 4300 RPM, 280 N⋅m at 1700 RPM engine (2008.3–2010.10)
680–840 rpm680–840 rpm680–840 rpm
All other modifications
630–780 rpm630–780 rpm630–780 rpm
Voltage swing at test speed
0.3 V0.3 V0.3 V
(More than).
To reduce environment impact and pass government inspections keep emission parameters at the level prescribed by Volkswagen.
Please be noted that all capacities listed here are approximate. Check fluid levels when adding or refilling as recommended in your 2008 Volkswagen Jetta user's manual. Keep in mind that all information here is provided “as is” without any warranty of any kind.
Before doing any DIY service please check your insurance policy and Volkswagen warranty policy for your region. In some regions DIY service may invalidate your warranty.
DIY car service is not as difficult as it looks like and it might save you thousands of dollars per year. It might be even fun and a good thing to do with your kids on a weekend to teach them how basic machinery works. It's really hard to screw something up and damage your car permanently if you use right tools, follow Volkswagen Jetta service manual and use right parts and fluids in prescribed amounts. Even modern cars stuffed with electronics can be serviced in your garage or even in your driveway. Changing engine oil, brake fluid, ATF, replacing brake pads, and etc. It's all may be done by yourself in a mater of a couple of hours.
Doing basic service for your 2008 Volkswagen Jetta you're not only saving money, but also also improving your technical skills and learning something new.