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Boxster 986; P1502

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My Boxster is sick


Vehicle ; 2000 Boxster

                5 speed

                74K miles


A few months ago, the starter would not engage when trying to start car.  It would start and run perfectly after 3-4 attempts.  I checked brake and clutch interlock switches.  They seemed to be working correctly. I suspected a starter issue.  I had replaced the ignition switch a couple of years ago.


Car started last Saturday after 3-3 attempts.  Ran great.  Parked car, came back 3-4 hours later, dash lights flickered when I tried to start.  Car finally started, ran for a few seconds then died.  This occurred 2-3 times.  Car then started.  Pulled into garage.  Car would only rev up to about 1600 RPM.  Found P1502 code. Cleared code and attempted to restart.  Starter still engages sporadically but did start.  Still in limp mode.


I would appreciate any suggestions on how to proceed to get the car back on road!





Edited by pcsbob
update car info
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Always a good idea to either:

1. include your model year and model in your profile so it shows next to your message.

2.Or include the info in your posting.


Either helps people trying to help you.


-  Short circuit in wiring harness
– Sluggish throttle
The vehicle is in emergency air function mode, i.e. the engine is turning at approx. 1200 rpm

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Thank you for the reply.

i have added vehicle info ot the post.

My gut tells me that the issue is the throttle.  I pressed the throttle when it started and died.  I thought this might have created the problem.  

Do you have any advice how to check the throttle?


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i got the car started.  It was still in limp mode.  Cleared the codes while running.  Limp mode cleared!    Took car for 30 minute drive.  Ran well!


Turned car off, restarted and limp mode returned.  Car also seemed to be stumbling. Clear codes and back to normal.  I believe that the throttle position sensor is the problem.  


Any thoughts on the diagnosis?


Still does not explain the problem I have experience with the starter.


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