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RE: 2021 MX13 pac car dpf and scr efficiency issues in need of egr tuneup - mikkhh - Yesterday
New sensor from dealership installed, with engine OFF sensor reading is fluctuating at 5-20 hPa. That does not seem logical or normal.
New sensor baseline where it fluctuates is 10hPa
Year old sensor baseline is 4hPa
Wiggling the wiring or plug does nothing, wiggling the ECM does nothing, keep in mind the truck is only five years old.
Those readings are relative, it means intake sensor reading - ambient pressure. IMAP readings with engine off must be 0. Engine running at idle should be 20-30hPa positive boost pressure.