DeoxIT® D5 on oxidized O2 sensor contacts

by Matt Heffner

GOOD NEWS - Your products are amazing!

Well, I've got good news, I figured out my problem. When I drove my car I noticed that it ran fine for the first couple of minutes then acted up.

I immediately thought of the O2 sensor as the potential culprit, since it ‘s active for the first couple of minutes when the engine is cold (until it can reach a high enough temperature to generate a voltage signal). I pulled the car into the garage, started the engine, and held the throttle open at the throttle body to keep the revs up above 2000 rpm.

After a few seconds, the engine jerked back and forth and ran badly (like it was being flooded). I disconnected the O2 sensor and repeated the procedure, and sure enough the engine ran smoothly for more than 2 minutes. As we speak, the O2 sensor harness is disconnected and the car is running fine.

I'll be purchasing a new O2 sensor tomorrow, but I suspect it had been bad for quite some time (maybe even since I purchased the car). The connector contacts were so oxidized, that the ECU was never receiving the bogus signal from the sensor. It was like the sensor was never connected.

Now that it is (when using the DeoxIT® D5), I am seeing the results of the malfunctioning O2 sensor. It was a case of your product working too well :-)

P.S. I will highly recommend DeoxIT® D5 to all my VW buddies!!!

Thanks for your help,

Matt

NOTE:
DeoxIT® GOLD
DeoxIT® GOLD GxL (formerly ProGold GxL)
DeoxIT® SHIELD
DeoxIT® FaderLube (formerly CaiLube MCL)
DeoxIT® FaderGrease (formerly CaiLube MCL P20 & P40)
DeoxIT® Grease Type M260 & L260 Paste (formerly CaiLube Grease).