99 VDP - All O2 Sensor Heater Circuit Codes
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Senior Member
Joined: Oct 2010
Posts: 261
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From: Bloomsbury, London
99 VDP - All O2 Sensor Heater Circuit Codes
Hi gents,
Just had the CEL come on this week, showing a failure of the heater circuits for every o2 sensor on the car. Is there a central fuse or relay that could be toast? Feeling like this is probably a single-source issue. As always, your thoughts are appreciated.
Best,
David
Just had the CEL come on this week, showing a failure of the heater circuits for every o2 sensor on the car. Is there a central fuse or relay that could be toast? Feeling like this is probably a single-source issue. As always, your thoughts are appreciated.
Best,
David
Veteran Member
Joined: May 2012
Posts: 3,290
Likes: 1,328
From: Winchester, CA
The heated O2 sensors are controlled in 2 ways. First is power from a 30amp fuse at #11 iin the engine management control fuse box. It is the smaller one under the bonnet. The second is some are equipped with a relay #6 in the passenger side control box with a 10amp fuse at #14 in the engine management control box.
The heated sensors are only the uppers. The relays are all the same so you can switch one around if yours was equipped with relays. I recommend relay #2 that one is the A/C clutch relay and won't effect engine operation.
The heated sensors are only the uppers. The relays are all the same so you can switch one around if yours was equipped with relays. I recommend relay #2 that one is the A/C clutch relay and won't effect engine operation.
Thread Starter
|
Senior Member
Joined: Oct 2010
Posts: 261
Likes: 29
From: Bloomsbury, London
The heated O2 sensors are controlled in 2 ways. First is power from a 30amp fuse at #11 iin the engine management control fuse box. It is the smaller one under the bonnet. The second is some are equipped with a relay #6 in the passenger side control box with a 10amp fuse at #14 in the engine management control box.
The heated sensors are only the uppers. The relays are all the same so you can switch one around if yours was equipped with relays. I recommend relay #2 that one is the A/C clutch relay and won't effect engine operation.
The heated sensors are only the uppers. The relays are all the same so you can switch one around if yours was equipped with relays. I recommend relay #2 that one is the A/C clutch relay and won't effect engine operation.
Junior Member
Joined: Jul 2014
Posts: 13
Likes: 0
From: Longwood, Florida
Any reports on the fuse situation?
Was a blown fuse or bad relay the problem ?
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