P1123 , P1125 (Pending) - How to troubleshoot further?

[ubergeek]

Now that I have this info, how do I troubleshoot further?

Thanks.

Year: 1999

Make: Porsche

Model: 996

Engine: 3.4

VIN:

License:

Mileage:

Stored:

P1123 O2S Sensing Range 1 Cyl. 1-3

Pending:

P1125 Oxygen Sensor Adaptation, Upper Load Range, Bank 1, Above Limit

MIL ON

Misfire Monitoring Complete

Fuel System Monitoring Complete

Comprehensive Component Monitoring Complete

Catalyst Monitoring Not Complete

Heated Catalyst Monitoring Not Supported

Evaporative System Monitoring Complete

Secondary Air System Monitoring Complete

A/C System Refrigerant Monitoring Not Supported

Oxygen Sensor Monitoring Complete

Oxygen Sensor Heater Monitoring Complete

EGR System Monitor Not Supported

DTC For Which Freeze Frame Was Stored P1123

Fuel System 1 Status Closed Loop

Fuel System 2 Status Closed Loop

Calculated LOAD Value 1.96 %

Engine Coolant Temp 197.6 °F

Short Term Fuel Trim-Bank 1 0.78 %

Long Term Fuel Trim-Bank 1 3.91 %

Short Term Fuel Trim-Bank 2 -0.78 %

Long Term Fuel Trim-Bank 2 2.34 %

Engine RPM 689.50 rpm

Vehicle Speed Sensor 0.0 mph

Automatic Transmission Problems:

Check Engine Light:

Light Always On

Driving Conditions When Problem Occurs:

2-10 Miles

Driving Habits:

Mostly City Driving

Engine Quits Or Stalls:

No Symptoms

Engine Temperature When Problem Noticed:

Warm

Problem First Noticed:

Started Last Week

Gasoline Used:

91 Octane

More Than 91 Octane

Idling Conditions:

No Symptoms

Peculiar Smells:

Problem Occurs:

Morning

Problems Starting Vehicle:

No Symptoms

Running Conditions:

No Symptoms

Strange Noises:

Weather Conditions When Problem Occurs:

32-55 F (0-13 C)

Transmission Type:

Describe The Problem:

[Richard Hamilton]

I had P1123 and P1125 for a long time on my car (UK Spec, so no CEL). I tried the remedies in the manual: fuel pressure, EVAP canister purge valve, etc, but what fixed it was a new MAF.

[Izzy]

For a 1999, you may have over 60K miles? You may be due for O2 sensors and MAF. I had the same exact codes on the same year, 62k miles. MAF and O2 sensors cleared it

[Topless]

Unplug the MAF and run it in default mode for about 50mi. If the codes don't reappear clean/replace the MAF.

[ubergeek]

The problem came back and now I see the pattern. I hope this information can help someone further troubleshoot the issue.

Based on FF, I can tell you 1123 gets trigged when the engine is in idle. Temp of Cool = 195.

Does it help at all? Should I just go ahead and replace the MAF? Yes I did clean it.

3/20

DTC For Which Freeze Frame Was Stored P1123

Fuel System 1 Status Closed Loop

Fuel System 2 Status Closed Loop

Calculated LOAD Value 1.96 %

Engine Coolant Temp 194.0 °F

Short Term Fuel Trim-Bank 1 -3.13 %

Long Term Fuel Trim-Bank 1 8.59 %

Short Term Fuel Trim-Bank 2 -0.78 %

Long Term Fuel Trim-Bank 2 6.25 %

Engine RPM 703.50 rpm

Vehicle Speed Sensor 0.0 mph

4/1

DTC For Which Freeze Frame Was Stored P1123

Fuel System 1 Status Closed Loop

Fuel System 2 Status Closed Loop

Calculated LOAD Value 1.96 %

Engine Coolant Temp 197.6 °F

Short Term Fuel Trim-Bank 1 0.78 %

Long Term Fuel Trim-Bank 1 3.91 %

Short Term Fuel Trim-Bank 2 -0.78 %

Long Term Fuel Trim-Bank 2 2.34 %

Engine RPM 689.50 rpm

Vehicle Speed Sensor 0.0 mph

4/5

DTC For Which Freeze Frame Was Stored P1123

Fuel System 1 Status Closed Loop

Fuel System 2 Status Closed Loop

Calculated LOAD Value 1.57 %

Engine Coolant Temp 194.0 °F

Short Term Fuel Trim-Bank 1 -2.34 %

Long Term Fuel Trim-Bank 1 5.47 %

Short Term Fuel Trim-Bank 2 -2.34 %

Long Term Fuel Trim-Bank 2 3.91 %

Engine RPM 708.00 rpm

Vehicle Speed Sensor 0.0 mph

[1999Porsche911]

What does your MAF read at warm idle?

[viper501]

also try the air/oil separator bellows. as a 99 I'm sure it has probably cracked and is allowing for a vacuum leak

[ubergeek]

What does your MAF read at warm idle?

Unfortunately, my OBD reader (Innova 3110) does not give me that information..

Anyone in Redmond,WA to help me out ? :-)