HI. I have owned my 97 993 for two months and the check engine light came on again. The code is P0151. This is the 02 sensor-- something about low voltage on bank 2 sensor 1. Does this sensor need to be replaced or is something else wrong? where is this sensor? thanks, peter

 

I found this at a ford obd site. I might try to clean to sensor if i can figure out which on it is on my car.
Electrical:
· Contaminated HO2S sensor or connector (coolant, water, silicone, fuel, oil, etc.)
· Chafed/damaged wiring
· Crossed HO2S signal/signal return wiring
· PCM

 

Bank 2 (Cylinders 4-5-6, or passenger side of car), Sensor 1 is the first sensor prior to the cat on that side of the exhaust.

Low or no voltage would generally require replacing the sensor. Start here. If your problem goes away, then you are done.

 

thanks. I am hoping it just needs a new oxygen sensor. Could this be another problem? thanks

 

Don't spread any negative waves. Just try the O2 sensor. If that doesn't work, then take it from there....

 

Using the lap-top obd reader i was able to graph the two primary oxygen sensors at the same time and sure enough the sensor on the passenger side is sluggish compared to the other side. Sometimes not responding at all. Thanks Bob for help me narrow this down. Ordered the part last night.