O2 Failing, 2nd in a day!

[bryno]

I have ruined 2 x O2's in the last couple days (warrantied). It is bank 2 sensor 1, upstream.

I have recently received a code, replaced the o2, ran fine for 100+ miles. Also, I am using the Torque app on my android and I can monitor the o2 activity and the Fuel Trim. During that 100+ miles, the o2 activity fluctuanted like normal. After that initial 100+ miles, the o2 scanned activity and the fuel trim begin to loose activity and then go flat; no activity.

Am I looking at a possible short or bad ground? I went through all my grounding just 2 years ago.

The Bank 1 sensor is good. Also, I am using the Bosch 15175 and have a '99 D2.

Thanks in advance.

 

[KyleT]

swap sensors side to side and see what happens. might be the plug contaminated, or the ECM is bad.

 

[stocksuspension]

Make sure there's no oil/coolant leaking onto the connector. Unplug the 02 then get some contact cleaner and clean the shit out of it then blow some air through it. I would get some sealant and put it on the back of the connector to prevent it from shorting out. Replace 02 and enjoy

 

[bryno]

I swapped sensors already, killed an old O2 that I had still laying around and the bad one didn't work in the bank 1 side.

When I changed these plugs I sprayed with electronic cleaner very well (I have an oil leak, go figure) and applied dialectric grease to the connectors. Thought that might have been the problem too, but didn't seem to work.

 

[crown14]

Oil wicks up the wires in the loom, you will need to trace back up that harness untill you get it all.

 

[uglysteve]

Be careful troubleshooting the wiring. I fried an input to my computer doing that, with my ohm meter.
I had installed a bad sensor. The first thing I should have don?t was swap the left and right sensors to see if the symptoms moved. If not then it is the wiring or computer. Installed a used computer after that.
Could you be contaminating the sensor with oil or coolant in the exhaust?

 

[stocksuspension]

I swapped sensors already, killed an old O2 that I had still laying around and the bad one didn't work in the bank 1
side.

When I changed these plugs I sprayed with electronic cleaner very well (I have an oil leak, go figure) and applied dialectric grease to the connectors. Thought that might have been the problem too, but didn't seem to work.

Do not apply dialectic grease tonconnectornxontacts. Dialectic grease is a non conductive grease

 

[discostew]

Do not apply dialectic grease tonconnectornxontacts. Dialectic grease is a non conductive grease

You sure about that ? Make sure the terminals are seated into the plastic housing of the connector. They get pulled out sometimes. Terminal backed out of connector trick.

 

[stocksuspension]

You sure about that ? Make sure the terminals are seated into the plastic housing of the connector. They get pulled out sometimes. Terminal backed out of connector trick.

Yes I'm sure

 

[discostew]

Yes I'm sure[/quote

Your right

 

[evoasis]

hey UglySteve:

Did you have any issues swapping in a used ecm/ ecu? I'm worried the anti-theft will revert to immobile mode or something.. I hear it's a good practice to swap out a matching spider box too?.?.?

 

[uglysteve]

hey UglySteve:

Did you have any issues swapping in a used ecm/ ecu? I'm worried the anti-theft will revert to immobile mode or something.. I hear it's a good practice to swap out a matching spider box too?.?.?

I took it to an independant shop with Testbook. They installed it for $100. They copyed the EEPROM using Testbook. The only isseue is that the VIN in the computer could not be changed, so if anyone connects Testbook, they need to know that vin number. When I connect my scanner, it shows the vin of my truck, not the new computer. No problems with my emissions test. Everything works fine. The used computer cost $120. What is the "spider box"?

You have to get a computer with LOWER miles than your truck. They can only add miles to the computer, they cant roll it back.!!

Steve

 

[KyleT]

D2 doesn't have the spider box.

 

[discostew]

D2 doesn't have the spider box.

What are they calling a spider box Kyle ?

 

[JohnB]

BCU

A shop told me you can swap dme and bcu from D2 to D2 and it will start. Just make sure the BCU is optioned like your D2. Speedo miles will flash.

I have tried swapping dmes before with no luck. I have a running D2 for parts and when I get a chance I am going to experiment.

 

[KyleT]

you have to swap all to not have a problem (BCU, ECM, SLABS, Cluster, and iirc the airbag module under the center console).

you can make single swaps work, but you have to resync via testbook or some other means. and yes it will revert to whichever has higher miles.

BCU is not the same as the spider...

whats DMEs?

 

[DarylJ]

Do not apply dialectic grease tonconnectornxontacts. Dialectic grease is a non conductive grease

Dielectric grease is non conductive. You have that much right.

But the concept of putting dielectric grease on connector pins is to protect the portions that do not have metal to metal contact from corrosion which will spread into the mechanically connected portions. Every automotive connection in a modern vehicle I've ever seen was designed in such a way as to clean the connectors while inserting them. This works just fine for dielectric grease and leaves you with a more weatherproof electrical connection in the end.

 

[DarylJ]

What are they calling a spider box Kyle ?

It's a black box under the radio on most D1s. It's mostly a box of relays that the immobilizer uses to control voltage to the fuel pump and some other bits. It's trivially bypassed with either a commercially-available plug or a couple of jumper wires soldered in.

 

[stocksuspension]

Dielectric grease is non conductive. You have that much right.

But the concept of putting dielectric grease on connector pins is to protect the portions that do not have metal to metal contact from corrosion which will spread into the mechanically connected portions. Every automotive connection in a modern vehicle I've ever seen was designed in such a way as to clean the connectors while inserting them. This works just fine for dielectric grease and leaves you with a more weatherproof electrical connection in the end.

Right..... Mr. Modern vehicle man