Martyn85 Posted July 29, 2017 Share Posted July 29, 2017 Hi, all had my car read yesterday, and I've got code p3138 which is variable intake manifold, switchover valve; regulation difference. Has anybody had this fault before and could shed some light on it for me please? I've had the glow plug light flashing that's why I had the codes read. Quote Link to comment Share on other sites More sharing options...
Trevor Posted July 31, 2017 Share Posted July 31, 2017 I would advise running a fuel cleaning solution through the engine and also one for the intake as it sounds like the valves are sticking with carbon build up. Possibly try Terraclean treatment and I believe that they come out to your home or workplace to clean the engine through 1 Quote Link to comment Share on other sites More sharing options...
Martyn85 Posted July 31, 2017 Author Share Posted July 31, 2017 Thanks for th reply Trevor, I have a fuel cleaner ready to put it just waiting to use up my remaining diesel. For the intake what solutions are out there for that as I've never owned a diesel before I've always been a petrol kind of man. I was maybe thinking of a terraclean as a last solution. Quote Link to comment Share on other sites More sharing options...
Serdar Posted April 18, 2019 Share Posted April 18, 2019 Hi, I've got the same error p3138 in my audi a3 8p s-line 170hp. How did you figure out to fix this problem? Quote Link to comment Share on other sites More sharing options...
Martyn85 Posted April 30, 2019 Author Share Posted April 30, 2019 On 4/18/2019 at 9:59 AM, Serdar said: Hi, I've got the same error p3138 in my audi a3 8p s-line 170hp. How did you figure out to fix this problem? Hi, my car eventually went Into limp mode took it back to where I bought it from (still under warranty) had it looked at and the dpf was fully blocked. I went 50/50 with the owner and had dpf delete and remap. Not one problem since. Coming up to two years soon Quote Link to comment Share on other sites More sharing options...
Muhith khan Posted October 13, 2019 Share Posted October 13, 2019 Hi I got an Audi A3 2007 1.8tfsi I got the p3138 code It comes up as switchover manifold valve what das a switchover valve look like please anyone Quote Link to comment Share on other sites More sharing options...
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