Help! Emissions Time again: is my O2 sensor bad?
Thread Starter
TECH Enthusiast
Joined: Jul 2005
Posts: 732
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From: Herndon, VA
Help! Emissions Time again: is my O2 sensor bad? Doh! 
I just had to throw out a good speed density tune and have the car reflashed to stock. I then replaced the SLP MAF sensor (which has been unplugged for months) and added a Predator tune. I'm throwing 4 codes:
1) P0102 Mass Air Flow Circuit. Low Input
2) P0327 Knock Sensor 1 Circuit, Low Input
3) P0801 Reverse Inhibit Control circuit Malfunction
4) P0803 Upshift Solenoid Control Circuit Malfunction
The first problem is what's killing me. It's a brand new MAF Sensor, and started throwing the code before ever running the car for any length of time. Here's what the Predator tells me with the engine at 165*:
MAP = 2-10; Idle = 4 WOT = 10
Spark = 21.6* - 40* depending on the throttle
MAF = 0.311 b/m
HO2S Bank 1 Sensor 1 = 790-850 Mv (higher than the others)
........Bank 1 Sensor 2 = 490-535 Mv
........Bank 2 Sensor 1 = 460-500 Mv
........Bank 2 Sensor 2 = 465-510 Mv
KR = 0*
The Low frequency Knock Snesor went bad a while ago, and I'm about to do a Head/Cam swap, so I'll replace it then.
The Reverse Inhibit malfunction is because the guy who installed my Mcleod clutch screwed up.
The Skip Shift hasn't worked since I installed 4.10s, but it never threw a code for it before...
So, is my O2 sensor bad (Bank 1 Sensor 1)? Or is it something else I need to do? Any help will be lavishly praised...
I just had to throw out a good speed density tune and have the car reflashed to stock. I then replaced the SLP MAF sensor (which has been unplugged for months) and added a Predator tune. I'm throwing 4 codes:
1) P0102 Mass Air Flow Circuit. Low Input
2) P0327 Knock Sensor 1 Circuit, Low Input
3) P0801 Reverse Inhibit Control circuit Malfunction
4) P0803 Upshift Solenoid Control Circuit Malfunction
The first problem is what's killing me. It's a brand new MAF Sensor, and started throwing the code before ever running the car for any length of time. Here's what the Predator tells me with the engine at 165*:
MAP = 2-10; Idle = 4 WOT = 10
Spark = 21.6* - 40* depending on the throttle
MAF = 0.311 b/m
HO2S Bank 1 Sensor 1 = 790-850 Mv (higher than the others)
........Bank 1 Sensor 2 = 490-535 Mv
........Bank 2 Sensor 1 = 460-500 Mv
........Bank 2 Sensor 2 = 465-510 Mv
KR = 0*
The Low frequency Knock Snesor went bad a while ago, and I'm about to do a Head/Cam swap, so I'll replace it then.
The Reverse Inhibit malfunction is because the guy who installed my Mcleod clutch screwed up.
The Skip Shift hasn't worked since I installed 4.10s, but it never threw a code for it before...
So, is my O2 sensor bad (Bank 1 Sensor 1)? Or is it something else I need to do? Any help will be lavishly praised...
Thread Starter
TECH Enthusiast
Joined: Jul 2005
Posts: 732
Likes: 0
From: Herndon, VA
Originally Posted by ShevrolayZ28
I had a similar combination of codes after blowing a fuse. Check the fuse panel under the hood.
Gotta love the 60-cent fixes
Originally Posted by FUN LS1
Thanks, man. That was it: the Engine Sensor fuse (20 amp mini). You're the greatest! I owe you...
Gotta love the 60-cent fixes
Gotta love the 60-cent fixes
