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samjoandco -> fixing P0121 code for smog certification (9/20/2007 2:18:54 AM)
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i had a problem where my stick shift 2001 vw cabrio (driven for 90k miles) stalled while driving at 40 mph & would not start again. i got it towed to a AAA repairshop who replaced the spark plugs , wires , router, distributor and ignition coil. the car again died on me after 10 days for the same problem where ignition coil went dead again. this time the repairshop spent some more time on checking Check Engine light & ECM which was spitting the P0121 code. that code relates to throttle position sensor malfunction & the repairshop replaced the Throttle Body costing 600$ and the Check Engine light still does not go off. Now my questions:1> Do we need to really replace the Throttle Body or is it of any value in cleaning at 90 K miles. What is the schedule for changing it?2> The CL light came on when I had to change the dead battery on my car ( 6 months before this incident). Would cleaning the Throttle Body and adapting the throttle reslove the issue or replacing it is advisable?3> the Repair guy says the resistance measured on multimeter on the older Throttle Body is quite high compared to newly replaced Throttle Body, this is addition to smoother idlying on changing to the new one confirms that Throttle Body does need to be replaced. is this correct?4> The Code P0121 still has not gone and he says that it would need to be adapted by a VW shop to get it cleared. Any suggestions , please?
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