Hi All, need help with OBDII code P0442. I search the forum but found little information. My truck is a 99ML320 with 82K miles on it. I was monitoring the P0172 & P0173 codes after the CEL went off by itself and reset the code after about 100 miles of driving without the CEL comes back on. I believe the P0172 & P0173 codes were due to the gas cap as the CEL came on after I re-fuel the truck. And now there is a P0442 code but without the CEL light on. Would appreciated if anyone could help.
Jay.
Jay.