Problem after transmission fluid change

Francois850 · Post by **Francois850** » 01 Apr 2013, 19:41

So I did reset (again) the ECU with a fairly long battery disconnection, followed the Volvo relearn procedure, but it made no difference...

Post by **precopster** » 01 Apr 2013, 21:01

precopster wrote:I wonder if you put in the wrong O2 sensor. Which part number(s) did you purchase?

Can you provide an answer to this question so I can check the part number you fitted?

Francois850 · Post by **Francois850** » 01 Apr 2013, 21:12

precopster wrote:
precopster wrote:I wonder if you put in the wrong O2 sensor. Which part number(s) did you purchase?
Can you provide an answer to this question so I can check the part number you fitted?

Front: 15097 Bosch OEM
Rear: 15062 Bosch OEM
Sorry I believe I missed that question when you posted it.

Post by **precopster** » 01 Apr 2013, 22:55

It appears to be the right number, hopefully what was in the box matched the label.

It may pay to recheck the markings, if any on the sensor.

Short of this not working you may need to have a look at live data by means of a scanner to see if the oxygen sensors are switching correctly between around 0.3 volts and 0.9 volts and are in closed loop.

Francois850 · Post by **Francois850** » 01 Apr 2013, 23:09

I replaced the front oxygen sensor twice in one month, the first one was not OEM and it triggered a code P0131.... I then got a Bosch OEM...
But, while I had the first sensor, with P0131, the car was running just fine. At leat I could drive on the freeway at 75 mph if I wanted too.... I seriously doubt an O2 sensor has anything to do with my issue.
When I release the gas pedal after trying to accelerate, I hear that weird kinda whistle sound, hard to hear but still I notice it... I bet that points to the issue but what would make such a sound??? It's so weird!

Post by **precopster** » 01 Apr 2013, 23:16

Francois850 wrote:I replaced the front oxygen sensor twice in one month, the first one was not OEM and it triggered a code P0131.... I then got a Bosch OEM...
But, while I had the first sensor, with P0131, the car was running just fine. At least I could drive on the freeway at 75 mph if I wanted too.... I seriously doubt an O2 sensor has anything to do with my issue.
When I release the gas pedal after trying to accelerate, I hear that weird kinda whistle sound, hard to hear but still I notice it... I bet that points to the issue but what would make such a sound??? It's so weird!

Wished you'd mentioned this small detail earlier on.
On the contrary your symptoms point to O2 sensor or sensing of O2 sensors by the ECU or a faulty catalytic converter.

Francois850 · Post by **Francois850** » 01 Apr 2013, 23:24

I am sorry, I am trying... it's getting so confusing and I am not an auto mechanic. Ok, I believe you, I just have no way to test the sensors.

Post by **precopster** » 01 Apr 2013, 23:47

You need to test with a scanner or an oscilloscope. The switching is too fast for most meters.

I suggest getting it to a shop with equipment. Look in the Volvo Mechanics section and see if there's a recommended repairer in your region.

Francois850 · Post by **Francois850** » 01 Apr 2013, 23:57

I agree and thank you very much for your time! Hello to the Land Down Under!

sleekitwan · Post by **sleekitwan** » 01 May 2013, 22:40

Hi, on Transmission oil change apparently 'causing' a fault:

I had a gearbox (auto xmission) rebuilt, and they let the office junior put too little fluid in it.

It drove fine, except at every junction, if I took off fast, there was a sudden loss of drive, then I would brake (to avoid an accident!) and then when I hit the accelerator again, all was as normal.

SOLUTION: I would say the fluid level in the transmission is so low (only takes a pint or two short) that the torque convertor is STARVED either most of the time, or in my case, only when I accelerated sharply, it would all slosh out of the way of the convertor (I surmise).

I had previous experience in another car, of underfilling the auto transmission by only a litre or so, and I tried to inch the car up my drive just clear of the blocks I had jammed behind the wheels, and it did not budge. I pondered and read a bit, put in a bit more fluid and it was perfect.

So, if the quantity of fluid is borderline, you get weird lack of drive, if there is a 'feature' of the route that brings it on eg hill/acceleration/bump/turn etc etc.

On high mileage, when the transmission is wearing out, you get 'slippage' in a certain gear (it's like 'surging' and you mistakenly think it is the engine not keeping steady - the litmus test is to use a different gear or a downhill grade). Also, bad changes (revving up a bit as it shifts, indicating the clutches are worn and taking a bit of time to 'bite' - or weld themselves together if the friction material has all but gone).

In short, if you have a dipstick, use that to check the level, or whatever other means (eg the awful 'peephole' method, from under the car with the tranny hot, etc etc).

Me, I would probably know the symptoms well enough to just bung in more fluid - say a pint - 'blind' and see if matters improved. If not, you might have to be prepared to remove it of course.

Best regards.

Problem after transmission fluid change

Re: Problem after transmission fluid change