1994 Ranger 2.3L Trouble codes

[cmccul002]

Well, the truck is still running, but I have some trouble codes.

I got some continuous memory code:

172 - Heated Exhaust Gas Oxygen (HEGO) sensor- voltage signal indicates "Lean" (Bank #1)

181 - Heated Exhaust Gas Oxygen (HEGO) sensor- voltage signal not switching: indicates "lean" during part throttle engine operation (Bank #1).

332 - Insufficient EGR flow detected.

542 - fuel pump circuit open connection - Electronic Control Assembly (ECA) to motor ground,

Then KOER test -

172 - Heated Exhaust Gas Oxygen (HEGO) sensor- voltage signal indicates "Lean" (Bank #1)

332 - Insufficient EGR flow detected.

538 - Insufficient RPM chang during Dynamic Response test (Engine Self Run Test)

[G O R T]

Has the O2 sensor been replaced?

Depending on the EGR system arrangement, PFE and DPFE systems in particular, a rusted out EGR tube could cause both problems at the same time.

The Dynamic Response test code comes up if you didn't floor the gas at the right time of the KOER test.