You can use Ford O2 sensor codes to determine what exact issue with the sensor is causing a malfunction. It usually starts with the letter P and comprises five characters. There are 28 such codes, each pointing to distinct issues with the O2 sensor.
The Ford O2 sensor codes primarily indicate issues with the oxygen sensor’s circuit voltage, response time, or heater circuit. The problems range from sensor malfunctions, exhaust leaks, and faulty catalytic converters to issues with the sensor’s wiring or the PCM.
In this guide, I’ll explore the error codes including their meanings, targets, causes, and corresponding fixes for Ford’s oxygen sensor.
Table of Contents
The Ford O2 Sensor Codes With Details
When using the OBDII or other scan tool, you’ll find some codes that indicate issues with the O2 sensor. Under this segment, I’ll break down the O2 sensor location, codes, description, reason, and fixes. Here I Go:
| Code | Detail | Location | Cause | Solution |
| P0131 | O2 Sensor Circuit Low Voltage | Bank 1, Sensor 1 | O2 signal circuit issue with resistance and voltage or bad sensor | Change the sensor or repair the signal circuit |
| P0132 | O2 Sensor Circuit High Voltage | Bank 1, Sensor 1 | Shorted O2 sensor heater circuit or broken wires | Check the O2 sensor’s wires or voltage to repair |
| P0133 | O2 Sensor Circuit Slow Response | Bank 1, Sensor 1 | Sensor malfunction or exhaust leak | Fix the exhaust leak or change the sensor |
| P0135 | O2 Sensor Heater Circuit | Bank 1, Sensor 1 | HO2S heater voltage fault | Replace the O2 sensor or wire |
| P0141 | O2 Sensor Heater Circuit | Bank 1, Sensor 2 | Bad oxygen sensor or wire issue | Change the O2 sensor or wire |
| P0147 | O2 Sensor Heater Circuit | Bank 1, Sensor 3 | Faulty sensor heater circuit, sensor, or wires | Replace sensor heater circuit, sensor, or wires |
| P0151 | O2 Sensor Circuit Low Voltage | Bank 2, Sensor 1 | Shorted to ground circuit | Repair the signal circuit or change the sensor |
| P0152 | O2 Sensor Circuit High Voltage | Bank 2, Sensor 1 | Sensor reading incorrectly | Check and fix voltage readings |
| P0153 | O2 Sensor Circuit Slow Response | Bank 2, Sensor 1 | Sensor malfunction or exhaust leak | Change the sensor or fix any exhaust leak |
| P0155 | O2 Sensor Heater Circuit | Bank 2, Sensor 1 | HO2S heater voltage fault | Repair Short/Open/High resistance in wire or connectors |
| P0161 | O2 Sensor Heater Circuit | Bank 2, Sensor 2 | Faulty O2 sensor | Change the sensor |
| P0167 | O2 Sensor Heater Circuit | Bank 2, Sensor 3 | Faulty O2 sensor, heater circuit, or wiring harness | Replace the O2 sensor, heater circuit, or wiring harness |
| P2237 | O2 Sensor Positive Current Control Circuit/Open | Bank 1, Sensor 1 | Bad PCM/O2 sensor or burnt wires | Change PCM/O2 sensor or wires |
| P2240 | O2 Sensor Positive Current Control Circuit/Open | Bank 2, Sensor 1 | Damaged PCM/O2 sensor or burnt wires | Replace PCM/O2 sensor or wires |
| P2243 | O2 Sensor Reference Voltage Circuit/Open | Bank 1, Sensor 1 | Bad O2 sensor fuse | Change O2 sensor fuse |
| P2247 | O2 Sensor Reference Voltage Circuit/Open | Bank 2, Sensor 1 | Burnt O2 sensor fuse | Replace O2 sensor fuse |
| P2251 | O2 Sensor Negative Current Control Circuit/Open | Bank 1, Sensor 1 | Faulty PCM/O2 sensor or burnt wires | Change PCM/O2 sensor or wire |
| P2254 | O2 Sensor Negative Current Control Circuit/Open | Bank 2, Sensor 1 | Bad PCM and O2 sensor or burnt wires | Replace PCM and O2 sensor or wire |
| P013A | O2 Sensor Slow Response – Rich to Lean | Bank 1, Sensor 2 | Sensor issue, exhaust leak, or bad catalytic converter | Change the sensor, replace the catalytic converter, or repair the leak |
| P013C | O2 Sensor Slow Response – Rich to Lean | Bank 2, Sensor 2 | Bad sensor, faulty catalytic converter, or exhaust leak | Replace the sensor/catalytic converter or fix the exhaust leak |
| P013E | O2 Sensor Delayed Response – Rich to Lean | Bank 1, Sensor 2 | Faulty cat converter, damaged O2 sensor, or exhaust leak | Replace the O2 sensor/cat converter or repair the exhaust leak |
| P014A | O2 Sensor Delayed Response – Rich to Lean | Bank 2, Sensor 2 | Broken sensor/cat converter or wires | Replace the sensor/cat converter or wires |
| P2626, P2627, or P2628 | O2 Sensor Positive Current Trim Circuit Open/Low/High | Bank 1, Sensor 1 | Bad O2 sensor/PCM or carbon builds up in the sensor | Change the O2 sensor or PCM |
| P2629, P2630, or P2631 | O2 Sensor Positive Current Trim Circuit Open/Low/High | Bank 2, Sensor 1 | Faulty PCM or carbon builds up in the sensor | Replace the O2 sensor or PCM |
Wrapping Up
That’s all you should know about the Ford O2 sensor codes! Now, you can easily figure out the root cause of the error code and fix the bug.
Be sure to repair the issue via an expert if you don’t have basic mechanical skills. Otherwise, do it yourself.
Hope this guide helps you to know the ins and outs of oxygen sensor codes in Ford cars. The wiring diagram of the 4-wire Ford O2 sensor with the wire color is also live for you to check.
Good Luck with Fixing the Codes!
