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CEL after oil change showing codes P0238 P0234 P0106

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after cel change codes oil p0106 p0234 p0238 showing
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17K views 3 replies 4 participants last post by  h4rb  
T
#1 ·
I changed my oil the other day on my 2004 Passat 4motion 1.8t and right after I finished my CEL came on. Pulled the codes and received P0238, P0234, and P0106, all saying there is a problem with my boost. The car drives fine, i was already away for Thanksgiving and drove it all the way home without a problem (around 500 miles).

From the research I have done it seems like it could be receiving these codes from a dirty connection or something simple like that. I am not an expert mechanic or anything, but I like fixing problems myself if possible, especially with prices the stealership charges. Has anyone else had this problem or know what could be causing it? If so, could you tell me what to start checking ranging from cheapest/easiest to worst case? Also, is it going to kill my car to continue driving to work and home every day? (around 10 miles both ways)

Thanks for all your help in advance! Passatworld has saved me thousands in repairs so far haha

By the way, car just ticked to 185,000 miles today and has been running like a dream (until this CEL) also looks extremely nice, almost new inside and out except for a couple minor door scratches.
 
V
#2 ·
There is a sensor on the intercooler that is called the MAP sensor. That is one of the main sensors on the newer Passats (2001.5+ MY's) that reads boost. Intercooler is located off of the pipe that connects to the throttle body (big rubber one.)

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I'd check the sensor first to see if it is plugged in (easy of course :lol:) then remove it and clean it up if need be. Simplest thing to start with.
 
H
#4 ·
PZ has suggested the path of logic. If your problem occurred right after the oil change perhaps the "lost keys" theory. If you lose your keys what do you do? You simply retrace your steps until you find them, or in this instance, retrace everything you touched, moved, bumped, or cleaned when you serviced your car. Maybe you get lucky :)
 
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