i got a code 45 last night when i left my girls apartment. the code is "engine running too rich or too lean."

d16y8
i/h/e stage 2 cam

i haven't changed anything recently. can a oem fuel pressure regulator go bad? could that cause my problem?

 

Stage 2 cam may have soemthing to do with it. An 02 sensor would throw that code, check to make sure your O2 sensor is functioning correctly

 

Yup, probably the 02 sensor. However, I got this when I was running an SI ECU (p2t) with my gsr swap. I reset the ECU and ran a GSR ECU and the CEL never came back....

 

well my light went off, maybe the o2 got a funny reading and triggered the code and now its reading fine? i never reset it, it just went away.