Experiencing rough shifting and a sudden check engine light in your 2001 Ford Focus? If you’ve pulled the OBD2 code P1120, you’re likely facing a Throttle Position Sensor (TPS) issue. This code specifically points to a problem with the TPS circuit, which can lead to a variety of driveability problems, especially in older vehicles like the 2001 Ford Focus. Let’s delve into the symptoms associated with the P1120 code on this model and explore potential troubleshooting steps.
One common symptom linked to a faulty TPS, and subsequently the P1120 code, is erratic transmission shifting. Owners of the 2001 Ford Focus might notice delayed shifts, particularly between first and second gear, often accompanied by a noticeable jerk. Shifting from second to third might also feel sluggish, with the engine seeming to idle for an extended period before engaging the next gear. These transmission issues can significantly impact the driving experience, making acceleration feel weak and requiring more effort to maintain highway speeds.
Beyond shifting problems, a P1120 error in a 2001 Ford Focus can also manifest as engine stalling, especially at low speeds. Imagine coasting in heavy traffic or navigating downtown areas at speeds under 5 mph; a failing TPS can cause the engine to abruptly shut off. This isn’t a sputter or choke, but a sudden fuel cut-off, requiring a restart. This stalling issue can be dangerous and frustrating, especially in stop-and-go traffic.
While replacing the Throttle Position Sensor seems like the logical first step after receiving a P1120 code, as one owner discovered, it doesn’t always resolve the problem immediately. Even after a TPS replacement and CEL reset, the shifting problems and the P1120 code might reappear after driving a short distance. This indicates that while the TPS is implicated by the code, the root cause could be more complex, possibly involving wiring issues within the TPS circuit, PCM (Powertrain Control Module) problems, or even vacuum leaks affecting engine performance.
If you encounter a P1120 code on your 2001 Ford Focus accompanied by these symptoms, a thorough diagnostic approach is crucial. Don’t immediately assume a simple TPS replacement will fix it. Seeking a professional mechanic with expertise in Ford Focus diagnostics is advisable. They can utilize specialized tools to test the TPS circuit, check for wiring continuity and shorts, assess PCM functionality, and investigate other potential causes that could trigger the P1120 code and related driveability issues in your 2001 Ford Focus.
