2006 redline
120000 miles
bought it recently for peanuts.
few days later engine light comes on, using torque pro, the fault os for p0171- system too lean
my long term fuel trim is almost 30%
i clean the maf, check the voltage, it seems fine. start looking for exhaust leaks and find that the 2nd o2 sensor has a spark plug antifouler so obviously the catalytic converter must be hollowed out. take the spacer off, and sure enough i get a p0420 catalytic converter below threshold. also there was a p1133 code for o2 sensor 1 heater control insufficient switching. that code comes and goes but the other 2 are always there.
fuel injector/ fuel pressure is spot on also
should i replace the cat first or o2 sensor? im not worried about smog for now i just want to fix the lean condition
120000 miles
bought it recently for peanuts.
few days later engine light comes on, using torque pro, the fault os for p0171- system too lean
my long term fuel trim is almost 30%
i clean the maf, check the voltage, it seems fine. start looking for exhaust leaks and find that the 2nd o2 sensor has a spark plug antifouler so obviously the catalytic converter must be hollowed out. take the spacer off, and sure enough i get a p0420 catalytic converter below threshold. also there was a p1133 code for o2 sensor 1 heater control insufficient switching. that code comes and goes but the other 2 are always there.
fuel injector/ fuel pressure is spot on also
should i replace the cat first or o2 sensor? im not worried about smog for now i just want to fix the lean condition