o2 sensor troubleshooting

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mikeavery

Member - Posts: 7

Joined: January 03, 2011

Location: Connecticut, United States

Posted: September 19, 2011 at 8:43 PM / IP Logged

I have a 1998 vw jetta that has o2 sensor problems. I've already replaced the o2 that came up from the obd II system and still having problems. Just wondering if anyone knows what the wire layout should be for the car side of the o2 sensor connector. I assume its 12v and 5v with a ground but i have a 4 pin connector so whats the 4th one for? heater maybe, thanks in advance

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howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: September 20, 2011 at 4:28 PM / IP Logged

98 was a changeover year so I will give you two colours:-

WHITE/ red = 12V+ ign.

Brown to 0v (ground),

Black to engine management.Pin 38 0v

White to ditto, pin 15, 0.1 to 1v+ fluctuating, with a hot engine.

Blue / YELLOW =12V+ ign.

Brown to BROWN / black (or vice versa) to 0v (ground),

Brown to engine management. Pin 25 0v,

Black to ditto, pin 26 0.1 to 0.9 volts, as above.

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oldspark

Gold - Posts: 4,913

Joined: November 03, 2008

Location: Australia

Posted: September 20, 2011 at 8:33 PM / IP Logged

And NEVER measure the sensor pin with a DMM except when in circuit. (IE - never measure sensor resistance with an Ohm-meter unless specially designed to do so.)

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Disclaimer: *All information on this site ( the12volt.com ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.

o2 sensor troubleshooting

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