996 Carrera Limp Mode

[Ravi Matharu]

Hi there,

 

My '99 996 Carrera has just covered 130K miles (brought it at 30K) and the engine warning light is flashing as is D and 4 Gearbox lights.

 

Last full service was about 3 years ago. Filters, oil, brake, plugs I do my self annually.

 

I've plugged it into my laptop - Durametric and i'm getting error codes P1115 and P1119.

P1115 Porsche fault code 13 - Resist. limit O2S ah. of cat. conv. B1 exceeds limit value P1119 Porsche fault code 5 - Resist. limit O2S ah. of cat. conv. B2 exceeds limit value

 

I did change one of the O2 sensors about 6 months ago and all seemed fine.

 

Any Ideas on the best way to test the O2 sensors as I had to remove the catalytic converter last time as it was so tight.

 

Also I'm in the UK so temperatures are maximum 8 degrees centigrade and garage has a stripped  Mercedes 250SL (restoration project), so no space to get my Porsche inside.

 

Thanks

Ravi

[wizard]

Hello.

 

I always thought that the genuine Durametric had the facility to test O2 sensors in situ ? You might want to check that.

 

Flashing transmission lights/limp mode. Odd that the Durametric does not show up Tiptronic-related fault codes. Have you interrogated the Tiptronic specifically?

 

Tiptronic fluid and filter change needed possibly if it hasn't been done before. If not, check the fluid level in the transmission. An incorrect fluid level will prove problematical.

 

 

 

[Loren]

P1115 Oxygen Sensor Heating 1 Ahead of Catalytic Converter - Below Lower Limit
P1119 Oxygen Sensor Heating 2 Ahead of Catalytic Converter - Below Lower Limit

 

Possible causes:

- Heating current too low. - Contact resistance.
- Heating resistance too high.
- Open circuit in heating current circuits.
- Open circuit in H02S signal wire.
- Short to B+ (output stage cut off).

 

Start by...

Check resistance of H02S heating.
1. Remove connector of H02S 1/2 ahead of catalytic converter.
2. Connect ohmmeter on pin side to pins 1 and 2.
Display: 1.8 - 2.5 ohms at 20°C.
3. Connect ohmmeter on pin side to pin 1 and H02S housing.
Display:  infinite ohms

[Ravi Matharu]

Thanks for your responses and sorry for my late reply,

 

I tested the O2 sensors and one was showing the wrong resistance out so I replaced it with an original.

 

Cleared the two error codes, drove it for a week. No error codes returned.

 

Drove it for another week and the engine warning light has come back on.

 

The only error code is P1602 - 660 CAN timeout - instrument cluster, I'm charging the battery now.

 

Tiptronic light is still flashing, ATF level is fine and no codes found under the Tiptronic module.

 

Any other ideas?

 

Thanks

[hardtailer]

Late to the party but as mentioned above : change transmission fluid and filter (and/or flush it).

Edited March 30, 2018 by hardtailer