Wells SU5591 Fuel Tank Pressure Sensor Designed and tested to meet or exceed OE specifications for form, fit, and function See service manual for proper diagnosis and replacement procedures After component replacement, use a scan tool to clear any trouble codes (P-codes) or turn off the Check Engine Light (CEL), Service Engine Soon (SES) or Malfunction Indicator Lamp (MIL) If trouble codes (P-codes) are cleared with a scan tool, certain Engine Control Module (ECM) settings may need to be relearned by driving the vehicle before emission testing When replacing electrical components, check connectors for corrosion or breakage and repair or replace as necessary