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97 pontiac gp code 121glc4122 08-19-2008, 09:17 AM yes, i replaced a new map sensor and this code 121 is showing ? what could be the problem? BNaylor 08-19-2008, 09:21 AM That DTC is a throttle position sensor (TPS) issue. Checkout TPS performance. Use a meter (DMM). vBulletin®, Copyright ©2009, Jelsoft Enterprises Ltd.
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