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Well after replacing all the O2 sensors and the MAF sensor i am continuing to receive the following errors on my 2006 997:

P1108 Oxygen sensing adaption FRAU bank 2 lower load range

P2180 Mixture adaption checksum error bank 2

P2192 Oxygen Sensor control adaption FRAO bank 1 upper load range

P2178 Mixture adaption checksum error bank 1

P2194 Oxygen Sensor control adaption FRAO bank 1 upper load range

and this brand new wonderful code: P1165 Engine compartment purge fan that gave me a "bad engine compartment blower fan" error

Its scheduled to go into the shop next week but I would like to get some ideas on where to begin since it has been in the shop 3 times for the 5 first codes :angry:

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O2 sensors? None of these codes point towards any O2 sensors problems.

O2 sensors are there to help diagnose issues - rarely are they the issue.

All of you codes above point to an air leak that the DME can not compensate for.

Depending on the FRAU reading and RKAT readings

Possible fault causes (FRAU below limit):

- Incorrect main filling signal from hot-film mass air flow meter

- Fuel pressure too high

- Injection valve faulty (dripping)

- Tank vent faulty (does not close completely)

Possible fault causes (FRAU above limit):

- Intake system leaking (secondary air)

- Incorrect main filling signal from hot-film mass air flow meter

- Leak in exhaust system

- Fuel pressure too low

- Fuel injector faulty (stuck)

- Fuel pump delivery too low

Possible causes (RKAT above limit):

- Oil filler cap leaking (secondary air)

- Intake system leaking (secondary air)

- Crankcase ventilation leaking (secondary air)

- Incorrect main filling signal from hot-film mass air flow meter

- Leak in exhaust system

- Tank vent faulty (does not close completely)

Possible causes (RKAT below limit):

- Incorrect main filling signal from hot-film mass air flow meter

- Fuel pressure too high

- Injection valve mechanically faulty (dripping)

- Tank vent faulty (does not close completely)

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Thanks Loren.

Is there a specific type of testing equipment I should ask for to pinpoint the problem, or is it going to take some time.

Also how about the P1165 Engine compartment purge fan that gave me a "bad engine compartment blower fan" error.

I opened the engine lid and the fan does not even turn on. I heard there was a recall on the 997 fan motor. Do you know anything about that?

Thanks again

Edited by hjacobs2000
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Furthers tests will likely require a PIWIS or other sophisticated test gear that can read FRAs and RKAT.

I do not have P1165 on any of my lists - are you sure about that number?

Engine purge fan fault is P1675 - either way this is not likely related to your air leak problem.

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Furthers tests will likely require a PIWIS or other sophisticated test gear that can read FRAs and RKAT.

I do not have P1165 on any of my lists - are you sure about that number?

Engine purge fan fault is P1675 - either way this is not likely related to your air leak problem.

It was 1675. Is this the cooling fan on the engine lid?

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Yes, the engine purge fan. This fan only comes on when the engine (surrounding air) temp exceeds a set number. At that point it turns on and pulls cool air into the engine compartment. For most drivers this fan rarely comes on.

Thanks Thats what I thought. The dealer confirmed there is an issue with the fan and the DME. Originally the fan would stay on for 30 minutes or more after driving. Yesterday it 1165 CELd.

Ill take it in next week

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