If you’d like to try to fix code P0121 at home without throwing money at parts, you’ll want to follow the steps below for proper diagnosis. For each possible repair, the estimated cost of repair includes the cost of the relevant parts and the cost of labor required to make the repair. When it comes to making repairs associated with the P0121 code, one or more of the below repairs may be needed to solve the underlying issue. From there, a shop will be able to give you an accurate estimate for repairs to fix your P0121 code. Many, if not most, shops will apply this diagnosis fee to any required repairs if you have them perform the repairs for you. Depending on the shop’s labor rate, this typically costs somewhere between $75-$150. If you take your car to a shop for diagnosis, most shops will start with an hour of “diag time” (the time spent in labor diagnosing your specific issue). > Find a RepairPal Certified Shop Near You How Much Does It Cost to Fix Code P0121? These shops can not only help you figure out what’s going wrong before you waste time and money on the wrong parts, but they also offer a minimum 12-month, 12,000-mile warranty and stand behind all their estimates with guaranteed fair pricing. If you’ve tried cleaning the throttle body and checked the wiring for the TPS circuit but you’re not comfortable diagnosing this issue further at home, we recommend finding a RepairPal-certified shop to pinpoint the problem and give an accurate estimate for repairs. Using the live data function of the FIXD sensor and app allows you to read and analyze inputs from the throttle position sensor and the throttle body temperatures to properly diagnose a P0121 code. With a P0121 code, the first step is to get it properly diagnosed to figure out what is causing the malfunction in the coolant temperature circuit. Corrosion on terminal ends of electrical connections.In some cases, the car will not be capable of driving to the shop and will need to be towed. This problem can also cause intermittent knocking and even stalling for your vehicle. Depending on the failsafe strategy of your car, this could lead to limited speeds or acceleration. When code P0121 is triggered, your ECM will go into failsafe mode. When code P0121 occurs, it means that your Engine Control Module (ECM) recognized that your throttle position “A” circuit’s expected output voltage has either gone above or below the sensor’s expected range. Your TPS “A” Circuit has an expected output voltage range, as does your TPS “B” Circuit (if so equipped). This DTC can be triggered by a faulty throttle position sensor (TPS), a dirty or faulty throttle body, or damaged wires in the TPS circuit. Diagnosis: It is important to complete the entire diagnostic process when diagnosing the P0121 code.Repair Urgency: Fix this code immediately (same-day if possible) to avoid being stranded.Issue Severity: HIGH – Stop driving immediately. P0121 definition: Throttle Position Sensor (TPS) “A” Circuit Range Performance Problem.
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