92 civic code 43

[rutrw]

1992 Civic runs fine but check engine light comes on after it warms up , checked teh code and get 43, fuel pressure is ok could the o2 sensor be bad. Or should I be looking for another problem?

 

[swanny]

9/10 times it's the O2 sensor. Are you running a test pipe?

 

[rutrw]

no test pipe , all stock.