Audiobro Brand's Products

AFR value is constantly 22.05 on “both cylinders”.

 O2 sensors NOT plugged in.

 O2 module not connected to DATA PLUG properly.

 O2 module DATA PLUG not receiving 12V power.

 Accessory fuse blown or corroded.

 O2 module Faulty

AFR values (any value) always EXACTLY the same on “both cylinders”.

 O2 sensors NOT plugged in.

 O2 module not connected to DATA PLUG properly.

 O2 module DATA PLUG not receiving 12V power.

 Accessory fuse blown or corroded.

 O2 module Faulty

AFR value varies less than 0.5 (Example: 14.20 – 14.70) when throttle is twisted and released.

 O2 sensor faulty

 O2 sensor wiring damaged

 Factory OEM sensors are PLUGGED IN

AFR value periodically indicates 19.36 or 22.05 on one cylinder.

 O2 sensor plugs NOT securely SNAPPED together

 O2 sensor harness plug wires pulled from plug. (Firmly pull on EACH wire at the connector)

 O2 sensor faulty

 O2 sensor connection broken

 O2 sensor wire damaged (Melted by exhaust, rubbed through by drive belt, abrasion damage)

AFR value for ONE cylinder reads LEAN (AFR = 16.00 or greater always but engine idles good)

 Exhaust gasket leak.

 Weld at O2 sensor leaking (Use Soapy Water test to determine)

 Crack in affected cylinder’s exhaust pipe