Sc400

[Bandit]

I keep getting the Check Engine Light (CEL). I check the code and it is a code 27 (Sub O2 Sensor). I reset it and it will stay off for several days, then I'll call on the V8 engine and it comes on again. Does anyone know which O2 sensor this is?

I have the tool to remove the O2 Sensor, is there any sense in cleaning it? Or does it just have to be replaced?

When the sensor completely fails, does it enrich the air/fuel mixture or does it lean it out?

Thanks!

[2XLexV8]

O2 sensors can be funny critters.

The can be dying long before the computer agrees they're dead, or can influence other codes.

Some people want to replace O2 sensors like spark plugs. It's not necessarily a bad idea. If your 93 SC has over 100K, and the original sensors, you may want to replace them.

Remember to reset the computer, so your motor will learn the new units.

I had a catalyst code in one of my vehicles that turned out to be the O2 sensor. $80 vs. $900. Whew!