O2 sensor acting up ? Check relays

[Fernando87mj]

Been a while since posting but wanted to share , 

i was having issues with the o2 sensor being stuck at around 4.7 volts when warm , I tested the heater and I was only getting 8 volts instead of the usual 12-13 volts . Cruisers tips 1-6 and tip 28 and 29 have been done . I went and unplugged any connector I could find and sprayed everything down with electrical cleaner , also did that to the relay center . But still nothing . After reading , I saw a thread on naxja and some guy was having the same issue and it turned out to be his relay , so I tried the same and swap around the relay and yup, problem solved . 13 volts to the sensor heater now and now you can see the sensor switching from closed to open constantly 

[dvitha]

Those relays are in a area where lots of moister is. Cleaning the connectors and getting rid of the old grease on contacts is a sure way to solve many problems with idle. The relays normally last and just go's out, but don't lose volt thru put, however if a crack in the relay house happens, also small moister can get inside and cause corrosion, causing the above to happen. Cleaning and inspecting these relays should be a regular maintenance. Many people can go along time replacing parts and sensors still not finding a bad wire or connector to say the heater wire for o2 sensor.

[cruiser54]

Nice job!!