p0420 is a dead ringer for bad cats...the rear and front sensors are reading hte same on (ie cat is doing nothing) the side with number one cylinder (bank one)
p0420 is a dead ringer for bad cats...the rear and front sensors are reading hte same on (ie cat is doing nothing) the side with number one cylinder (bank one)
1991 Silverado ECLB
LM7-T56
Cool, well if it is a bad cat I dont know if I will replace it or not. I wouldn't think it would hurt anything leaving the "bad cat" alone and tuning it out would it?Originally Posted by r6z4o6
2006 K1500 Vortec Max CCSB 6.0 4.10's, Nelson SD Tune, Trick Turbo kit T76 @ 10psi, 60lb/hr injectors, 4" duramax exhaust, snowmeth stage 2 kit, FLT Level 5 4L70E, Vig 2600, 40K trans cooler, 265/70/17 BFG All Terrains. 13.0 @ 102mph 1.8 60ft
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