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Multiple Pcodes 1133 1126 2177 2187 2179 Where to start?


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2006 Cayman S with 56k miles and Fabspeed exhaust with sport cats.


Took the car out for a morning ride and the CEL came on.  Brought it home and pulled the codes.  Now the car will start, but rough idle and then shut off within a few seconds. With the multiple codes, I am looking for advice on where to begin in the diagnostic process.  The codes are:







Also, I have attached a photo of the engine that may provide a clue as to what is wrong with the car.


Thanks in advance



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P1133 Lambda control adaptation FRAU (lower load range) - below limit value or above limit value

Possible fault causes
- 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
- 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


P1126 Lambda control adaptation FRAU (lower load range) - below limit value or above limit value

Same as above (P1133)


P2177, P2187, P2179 

Same as above

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  • 2 weeks later...

Thank you for the suggestions.

I have checked the exhaust and do not see any sign of leaks.  Also, non of the fasteners are loose.

Before getting into the engine I thought it best to hook up the durametric and log from starting the car to when the motor shuts down. Does the attached log indicate an obvious failure of a device such as the MAF?



3-6-21 Cayman Starting log.csv

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Starting down the rabbit hole.  It turns out the BMC air filter has suffered a catastrophic failure. The red plastic on the ends of the filter has basically disintegrated. I'm hoping for the best as I clean the airbox and intake. The PO must have installed the filter when he/she installed the Fabspeed exhaust.  NEVER will I use a BMC product after seeing this level of failure.



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Yes sir. This is going to require a serious cleaning.  I'll be ordering a new MAF and filter today.  Do you know if it is possible to remove the airbox without dropping the engine?  I want to ensure I get every spec of the BMC filter out, which will be much easier if I can remove the filter housing.


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Getting there.. (I hope)..


So far, I have cleaned the airbox and used a scope to peer into the areas where I could not see and got all the gunk out.

The screen on the MAF was about 60% blocked by the gunk and I did not see much evidence that the gunk made it past the 2nd screen which is tighter than the first.

Replaced the air filter.

Replace the MAF with a new unit.

Cleaned the throttle body.

Replaced o-ring for MAF and o-ring for the throttle body.

Cleaned the inside of all connecting boots and as much as the intake as I could while the throttle body was out.


The car fired up without a problem and idled pretty well, but after 20 seconds or so threw a P0300 and P0301.  I shut it down immediately and checked the errors with the durametric.

Here's what It says for the 301 Misfire message.


Misfiring, cylinder 1

Freeze Frame Information
Fault symptom Limit exceeded  
Self test not complete  
Fault status fault not present  
Warning light off  
Fault path num 39424  
FLC/HLC state 10  
Fault check state 0A  
FCM line status 00  
FCM output data (mil, svs) 11  
Error Path Status 513  
Counter Continuous Error 0  
Counter Accumulated Error 256  
MIL on counter 1  
MIL off counter 3  
Clear counter 79  
Frequency counter 1  
Calculated LOAD value 40 %
Engine coolant temperature 25 °C
Short Term Fuel Trim - Bank 1 0 %
Long Term Fuel Trim - Bank 1 0 %
Short Term Fuel Trim - Bank 2 0 %
Long Term Fuel Trim - Bank 2 0 %
Vehicle speed sensor 0 km/h
Ignition Timing Advance for #1 Cylinder 9 °
Intake Air Temperature 28 °C
Absolute Throttle Position 14 %
Commanded Secondary Air Status 01  
Commanded Evaporative Purge 0 %
Barometric Pressure 1000 kPa
Relative Throttle Position 3 %
Ambient air temperature 24 °C
Absolute Throttle Position B 14 %
Commanded Throttle Actuator Control 4 %
Long term secondary oxygen sensor fuel trim - Bank 1 0 %
Long term secondary oxygen sensor fuel trim - Bank 2 0 %
Fuel system 1 status 0B7F  
Engine RPM 1088 rpm
Air Flow Rate from Mass Air Flow Sensor 10 g/s
Absolute Load Value 44 %
Total operating time (first occurrence) 1851.1 h
Total mileage (first occurrence) 87996 km


Should I proceed to check the coil pack on cylinder 1 or may there a remaining issue left over from the failed filter?


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