2000 volvo s80 2.9

Ttwerie · Post by **Ttwerie** » 30 Dec 2018, 06:06

Transmission service required came on simultaneously with Check Engine Light. Car is running and shifting fine with no slippage at all. FYI. Just had timing belt, seals replaced due to a a failed idler pulley and oil leaking on timing belt. Any ideas? FYI this is NOT the transmission service urgent message.

Post by **SuperHerman** » 30 Dec 2018, 13:40

How many miles on vehicle? How many miles since the transmission fluid has been changed?

How many miles since the timing belt and related was changed?

Do you have the actual codes?

It is possible that the two codes are unrelated.

Ttwerie · Post by **Ttwerie** » 30 Dec 2018, 16:50

Timing kit and seals just changed couple of days ago
Tranny fuid about 35-40k ago, still looks red with no burn smell
Car has 166K
Will update with codes
Thanks for any advice

Post by **SuperHerman** » 30 Dec 2018, 21:53

99% of the time the issue is the timing is not set correctly - a mistake was made with the VVT. I would start looking there. It can take 2-3 start/stops to trigger the CEL. What constitutes a start/stop is a book in itself, but it takes a certain cycle type.

For the tranny issue, it may be a matter of changing the filter and fluid and resetting the tranny oil change counter. On other Volvos, not sure on S80 but I assume the same as other Volvos, if the tranny fluid overheats 3 times it will throw a code. Excess heat kills the fluid. You will need VIDA or a full feature scanner to do the reset.

It may be possible the warning is one of the three you get before a constant service light. Then it may be the second or third - not sure how the system works. Although if it is staying on it is most likely the third. That is the first thing I would consider.

Filter and fluid are cheap - Dex 3 is the recommended fluid. It is a GM transmission so filters and gasket are affordable and plentiful. As you recently changed the fluid, although at 35-40k on it, it wouldn't hurt to do it again. Otherwise just reset the change counter - one has to physically do this as the computer does not know new fluid was put in unless it is reset. Was it? If not and the filter was changed, then I would just do a drain and fill - plus reset.

Ttwerie · Post by **Ttwerie** » 31 Dec 2018, 04:50

So I assume what you are saying is that the CEL is not related to the transmission service required message even though they illuminated simutaneously? That would concern me cause like i said timing kit just installed but car is running great

Thank you very much for your responses. You are very helpful!

Post by **SuperHerman** » 31 Dec 2018, 20:10

It is hard to tell if they are related or not, without seeing the actual codes the computer is producing and knowing more of the car's history.

I would start with solving the engine CEL - if they are related the transmission message will solve itself when the cause of the engine CEL is resolved.

Ttwerie · Post by **Ttwerie** » 01 Jan 2019, 05:16

Update
Transmission service required was able to be reset with OBD. The CEL was as you said unrelated due to a heater control bank 2
o2 sensor. Just need to figure out location of paticular o2 sensor which Im guessing shorted to ground and should be good to go

Thanks for all your help

Post by **SuperHerman** » 01 Jan 2019, 10:57

Is it the upstream O2 sensor or the downstream? Upstream will is located right after the exhaust manifold on the driver's side (Bank 2). You should be able to access it for removal fairly easily, might have to remove the engine torque strut bar. You wills see both front O2 sensors where the turbo heat shields afix to the exhaust. The cable will be secured with a zip tie at some point and clips as it winds its way to the harness. The other O2 sensor, downstream, will be on the same side but near a cat when looking up from below the car. Which ever one just pay attention to how the wiring is secured so you can put it back the same way.

On either O2 sensor, install the sensor first, as the rotation when screwing it in will cause the wiring to coil. I use a normal O2 sensor removal tool, 7/8" if I recall correctly, with a slit in it to pass the wire.

Ttwerie · Post by **Ttwerie** » 01 Jan 2019, 13:44

Unsure if the upsteam or downstream one. Hopefull upstream from soundcof it. How will I know. Probably a dumb question but if one of these O2 sensors are bad could it effect the heat in car? Happy New Year by the way!!

Post by **SuperHerman** » 01 Jan 2019, 15:08

Happy New Years to you and the rest as well.

O2 sensor will throw a code that the OBD2 reader will display - the code will differ between the four O2 sensors.

I was answering your question with the assumption the code that was thrown was for the O2 sensor.

Heat in car should not be affected. Have you checked your coolant level? Heat could be all sorts of things (heater/cooling related). It is also possible a coolant temp sensor may be the culprit of your engine code. Did you check the connection for the sensor - it may have been touched when the timing was done.