Hi, I've recently had my 2004 tip in a garage where they've replaced the gearbox. When they returned the car it has a cel on and they explained that they've had a quick look but can't see the problem but might need 2 new o2 sensors. I've rigged it up to my scanner and get P0134 and P0154 codes. If I reset the codes they return within 2 or 3 miles. I've read it's rare for both sensors to fail at the same time - would you suggest checking anything else before I get them both replaced? Car seems to be running fine. 2004 2.7 986
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Porsche Boxster Oxygen Sensor Replacement - 986 / 987 (1997-08) - Pelican Parts Technical Article