Page 127 of Volkswagen Parts 2008 by PartsPlace Inc.

tdi electronics etc air flow meter these go bad a lot and seem to be related to carbon/sludge in the intake systemsee also intake manifolds egr valves some people say that running the right oil in your tdi can help reduce the amount of crud that makes it to the intake we have not seen empirical proof of this but it can t hurt if yours goes bad you will probably have a loss of power along with the dreaded check engine light `96 99 tdi all `00 03 tdi all egr vacuum regulator solenoid valven18 #sn19559 .170.95 #sn20650 84.95 most tdi owners are awareor soon will be that tdi s are known to have a problem with the intake manifold and egr valve clogging up with sludge/carbon some customers have reported that the intake ports on their manifolds have gotten blocked up to the point where airflow is restricted to a passage about the diameter of a pencil this doesn t help the engine run better if your tdi doesn t have the power it used to check your manifold we have new manifolds and egr valves available intake manifold brand new `96 99.5 #sn18380 .289.95 `99.5 02 #sn17844 .329.95 wastegate bypass regulator valven75 `98 99 new beetle `99.5 golf/jetta #sn18410 .129.95 `00 03 golf/jetta/beetle #sn20651 .94.95 sold on an exchange basis `96 99.5 w/egr #sn19176 .229.95 `99.5 03 #sn17914 .149.95 are nothing more than heavy-duty switches if your glow plugs are not getting power and the fuse is good it s probably your glow plug relay if you re just driving along and the car craps out like somebody just turned it off it s probably the power supply relaythe 109 relay both go bad more than you would think relays intake air temperature sensorg72 fits all tdi golf jetta passat and new beetle 1996-2003 #sn18419 .2495 golf ® `99.5-08/jetta® `99.5-08 /newbeetle® `98-08 glow plug relay `96 97.5 #sn18433 .69.95 `97.5 03 #sn16320 .109.95 power supply relay `94 03 #sn19206 .17.95 ot e it or n believis not the e is ne we v th o worstseen v intake manifold changeover valven239 golf/jetta/new beetle `99 03 the tdi is the first volkswagen diesel to use electronics to control the injection timing and quantity there is no accelerator cable or cold start cable the computer handles everything if yours goes bad the engine probably won t run at all or very poorly at best to ensure we get you the correct computer get the part number off yours before you call available new rebuilt or used depending on part call electronic control unit #sn38315 14.85 this also tends to get blocked with crud the assembly includes the egr valve and the anti-shudder valve which closes off the intake air when the engine is shut off `99.5 03 golf/jetta/beetle tdi egr valve fuel shut-off valven109 it s a good idea to carry one of these as a spare-if it fails it can cut off the fuel supply to the injection pump and the engine will not run easy to replace all tdi s `96 03 #sn4009 .59.95 #sn17918 .200.95 does exactly what the name impliestells the computer the speed of the engine this is important for the engine to run properly also called the crank position sensor `96 98 engine speed sensor628 this is a dual sensor it sends a signal to the ecu and another signal to the guage either half of the sensor can fail without affecting the other these all go bad coolant temperature sensorg62 egr cooler `the egr cooler is a heat exchanger that cools the exhaust gases being released back into the intake manifold cooling the recirculated exhaust improves emissions power and fuel economy so if your cooler is plugged up with carbon or leaking coolant replace it immediately `99 `00 03 #sn19376 .99.95 #sn17950 .89.95 #sn17951 .29.95 `96 99.5 4 pin yelow black #sn16802 29.99 `99.5 03 4 prong brown #sn17961 42.50 note there are many sensors in the tdi models and many poor running conditions can be caused by a faulty sensor however like all electrical parts sensors are not returnable so make sure you diagnose the problem correctly before you order 99.5 03 #sn17943 .279.95 t-126 www.partsplaceinc.com 248-373-2300

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