Got two codes: 335(PFE or DPFE sensor volt out of range) and 332(Insufficient EGR Flow). I replaced the PDFE sensor because I had codes for it before. I found a brand new one and replaced it. Cleared the computer and drove it for awhile. Then read the codes and those are the ones I got. Could the EGR valve maybe be having problems. Gunked up or something that would give you a DPFE code? Also I got a code: 632(TCS switch circuit did not change states during KOER). Where is the TCS? And what should I do about it? Help appreciated. Thanks much.