surging RPM

[dzillweger]

Hi Guys

I have a 2000 tiptronic with 85,000 miles. Had a check engine light with code 1117 and surging RPM between 1400 and 2000 rpm idles fine and above 2000 rpm runs great. Replaced the oxygen sensors after the CAT per the code, cleaned mass air sensor, replaced air filter, unhooked mass air sensor test drove but the surging rpm still happening with no codes. Hoping for some suggestions on solutions.

Daniel

[Loren]

:welcome:

P1117 Oxygen Sensor Heating After TWC, Bank 1 – Above Limit

Potential causes:

– Heating resistance too low

– Short to B+

Did you use Porsche O2 sensors - many aftermarket sensors will not work in these cars.

If you did use Porsche sensors then - check wiring from DME control module, pin II/7, to disconnection point of oxygen sensor 1 after TWC for short to B+. If so, you have a shorted wiring harness.

[dzillweger]

:welcome:

P1117 Oxygen Sensor Heating After TWC, Bank 1 – Above Limit

Potential causes:

– Heating resistance too low

– Short to B+

Did you use Porsche O2 sensors - many aftermarket sensors will not work in these cars.

If you did use Porsche sensors then - check wiring from DME control module, pin II/7, to disconnection point of oxygen sensor 1 after TWC for short to B+. If so, you have a shorted wiring harness.

Thanks Loren

I used a Bosche sensors on the replacement. The wiring issues are way over my head. I guess I should take it in to have it looked at the repair shop.

Daniel

[JeTexas]

Loren, is there any chance he might just need new spark plugs or wires or would throw a code?

[dzillweger]

Loren, is there any chance he might just need new spark plugs or wires or would throw a code?

Thanks for help

New plugs about 1000 miles ago

Daniel

[Loren]

Some of the Bosch will work - and some won't.

The fault code points to only that sensor.

[dzillweger]

Some of the Bosch will work - and some won't.

The fault code points to only that sensor.

The Code is now gone after I replaced the oxygen sensor, I think that issue is ok. But what would cause the rpm to surge only in that rpm range of 1400 to 2000 while going about 30 to 50 mph. Runs great above 2000rpm and at hwy speeds,idles right at 650, good acceleration does seem to shift quick

Daniel