93 Ford escort has a 172 DTC, what could cause this? on 1993 Ford Escort

HEGO (too lean)

Asked by for the 1993 Ford Escort
1 answer 1 comment
Pull PCV Valve and check
PCV Valve operates as it should.....Just checked to be sure. thanks for your response.

Just got back from smog check. I replaced the O2 sensor and cleared the codes. It passed with flying colors, with no Check engine lite.

thanks for the help!