Watch this short video that will give you tell tale signs to look out for if your tune suddenly runs rich or lean. This video could save you hours of time on the dyno.

0:17 What is causing your rich or lean condition
0:42 What to look for to see if you have a bad O2 sensor
1:29 Sudden crash in AFR
1:37 Decrease in horsepower and torque torque curve
2:26 Different reading from the dyno vs the scanner
2:54 Injector pulse width
3:09 Sign that this is actually a bad o2 sensor
3:55 Slowly get leaner or slowly get richer

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