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Ahsai / JFP, thank you for your feedback. I went into the shop and they replaced the O2 sensors with test sensors. Car idle and performance was immediately stabilized. Bought and installed 2 new sensors $260 ea. with labor came to $1K. I wish I had done this myself... but I wasn't sure about the assessment so I didn't want to buy sensors and be wrong and start stocking Porsche parts ROOST
Hello Ahsai, thanks for the response... I started the car again and listened to the engine in the trunk - no major hiss- when I removed the oil cap the engine dropped significantly and almost cut out. replaced the cap and back to a rough idle (varying between 650 RPM to 1100 RPM) I lifted the oil filter tube but did not observe any cracks or leaks however these may be located further back beyond view. not sure how to test for vacuum leak / bad ignition coil ... I will voltage meter test the O2 sensors. Where should I do this?>> Engine compartment or behind wheels? Diagnostic scanner - which do you recommend for purchase? (http://www.durametric.com/buyus.aspx; or alternative?) I decided to go for a drive as the car sat for a few days. It started well and drove well for a few blocks then the issue creturned. I shot a small video (2MB) if that will help in assessment.
Hello Porsche experts, I recently purchased a used 911 Carerra, 2003 and had the fuel pump fail. So I looked around in Orange County to find a Porsche mechanic and ended up taking it to Hergesheimer. They replaced the fuel pump but a few days latter I experienced something very troubling. The car would start but idle was somewhat rough. Revving the engine was a challenge in the lower RPM 1000-3000 then it became a bit smoother when driving with load on the engine in the 3000-4000 RPM range. Alarmed by this I called the shop to bring the car in, but this was the day before the Rennsport Reunion in Laguna Seca so I dropped by another mechanic who brought up these error codes on a generic diagnostics tool: P0134 Sensor Circuit No Activity Detected (Bank I Sensor 1) P0101 Mass Airflow Sensor / Circuit range issue Performance problem P0154 O2 Sensor no activity detected (Bank 2 post CAT ) P2098 Post Catalyst Fuel Trim System Too Lean Bank 2 P2096 O2 Sensor no activity detected Post Catalyst Fuel Trim System Too Lean (Bank 1) P0156 O2 sensor circuit malfunction (Bank 2 Sensor 2 post CAT) Initially I thought this was related to the fuel pump replacement. So I called the shop who did the work and they said bring it over. Their analysis identified similar codes and they suggested a few hours to review the harness and sensors in order to asses the problem. A week later i am still trying to resolve this and wondered if I should replace the O2 sensors myself. I have done brakes and other minor maintenance. What is the opinion of the forum here on next steps? I can provide further detail