P0121 Code - Throttle/Pedal Position Sensor/Switch 'A' Circuit Range/Performance

What Does P0121 Mean?

P0121 is a generic OBD-II code which indicates that the Engine Control Module (ECM) has seen the TPS sensor circuit A learned output voltage go above or below the sensor's expected range when compared to TPS sensor circuit B.

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What are the common causes of P0121 ?

To sum things up, the common causes for code P0121 are as follows:

• TPS sensor is faulty
• TPS circuit is open or shorted
• The PCM is faulty

How To Fix P0121 ?

Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. Look at the plug wires to make sure they are not burnt or laying on the exhaust.

Process Tips

Diagnostic trouble code P0121 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before P0121.

Fortunately, P0121 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.



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