Hi guys,

the winter has started to break here in the Northeast. Ive had my Turbo out the last 3 days. Havent had it out since early Jan. Driving today the CEL light came on. Plugged in my OBD scanner and it read P1145.

Man Ive been getting CEL lights ever since I installed a preowned Cargraphics exhaust at the beginning of the year. I love the exhaust sound and the additional performance to my rocket. but I HATE CEL lights!

Has anyone had this CEL code come up? could it be an exhaust leak? bad 02?

Im bringing in the car for service next week but I like to have some ideas on what could be causing this.

 

O2 sensor going bad is your issue. THey probably broke something installing the exhaust system. I know Cargraphics doesnt thro CEL so it must be the o2.

GL

Suman

 

Thanks Suman for responding. I sent you a PM.

I hope its just a bad 02. Im sure my warranty will cover this.

 

Do you have 100 or 200 cell cats? My CG exhaust has 200 cell cats and hasn't created any cel problems.

 

Ive got the Cargraphics export loud version. I assume 200 cell cats.

 

P1142

Oxygen Sensing Error by means of Short Test, Bank 1 - Above Limit

Diagnosis conditions

• Mixture adaptation performed with the Porsche System Tester 2

Possible fault cause

• Incorrect signal from MAF sensor
• Intake air system leaking
• Fuel pressure too low
• Volume supply of fuel pump too low
• Fuel injectors fouled

Affected terminals

-

Diagnosis/Troubleshooting

NOTE: Air leaks ahead of the oxygen sensors can lead to a fault in adaptation, Refer to Check exhaust system for leaks

 

Phtom thanks for the analysis. but is that for 1142? I need it the diagnosis for 1145. thanks!

 

LOL my bad heres p1145

P1145

Oxygen Sensor Ahead of TWC, Bank 1 - Above Limit

Diagnosis conditions

NOTE: A lot of time is required (several days) until a fault is detected.

Possible fault cause

• Valve lift fault
• False air on the oxygen sensor after TWC
• Oxygen sensor

Affected terminals

-

NOTE

• As this fault can be caused by a faulty flat-base tappet, a system test for a small lift has to be performed initially. The fault can occur sporadically; the test should therefore be performed at least three times when the engine is at operating temperature.
• First indication of a valve lift fault can be provided by the adaptation values at idle speed (RKAT) and in the lower part load (FRAU) if they differ by more than 10 %.

Perform system test for small lift

WARNING: Test is carried out while driving. Have a second person operate the Porsche System Tester 2.

During the system test for small lift, the valves remain at small lift, regardless of the type of driving. Faulty switching conditions can be detected by rough running, just like with misfire detection.

Several cylinders may be stored as faulty, although only one valve on one cylinder is faulty.

In order to ensure that the fault is repaired, the flat-base tappets of the inlet valves of the entire cylinder bank should be replaced if a fault occurs.

A faulty flat-base tappet can be detected because the oxygen sensor FR for this cylinder bank enriches the mixture (FR > 1) during acceleration with wide open throttle, see drawing below. Difference from the other oxygen sensor > approx. 15 %. In the case of a fault, the flat-base tappets of the inlet valves for the entire cylinder bank must be replaced.

NOTE:

• If a fault is detected, it is only recorded in the fault memory after 6,000 ignitions (at idling speed approx. 3 minutes waiting time).
• It is important to observe the oxygen sensors during acceleration with wide-open throttle or to record their behaviour with the data logger.

Diagnosis/Troubleshooting

NOTE:

• Do not use contact spray on the connectors to oxygen sensor.
• If other faults (fuel supply) are stored in the memory, rectify these first

Work Instruction 1 - 2

NOTE: Do not exchange oxygen sensors ahead of catalytic converter and after catalytic converter.

Oxygen sensors ahead of and after catalytic converter




1-Oxygen sensor ahead of catalytic converter2-Oxygen sensor after catalytic converter

 

How do you know if it's from the O2 sensors before the cats or after the cats that are failing? Or is it assumed that all four should be replaced if you're getting this error?