We use cookies for basic analytics — nothing loads until you accept. You can decline and keep browsing normally. Privacy Policy
Diagnostic trouble code U066A indicates: Lost Communication With EGR Sensor E. It was set by your vehicle's onboard diagnostics system and will typically keep the check engine light on until it's addressed.
U066A is part of the EGR OFF group. These ECUs support EGR OFF, which switches it off:
Upload your ECU file and DTC Doctor will detect this code (and any others) automatically, then remove it for good — no dealer visit, no guesswork.
Analyze My File Free →