97 pontiac gp code 121

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glc4122

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).