What Does Code P0059 Mean When this trouble code sets it means there is some sort of malfunction in the heater circuit for the bank 2 sensor 1 oxygen sensor. This most likely means that the heater is non-operational. engine code P0059P0059 fixobd P0059dtc P0059obd code P0059obd2 P0059P0059 car codediagnostic code P0059car code P0059check engine code P0059fehlercode P0059P0059 fiatcodigo P0059codigo falla P0059P0059 kody błędówcodigo de falla P0059Possible symptoms Engine Light ON (or Service Engine Soon Warning Light) Possible causes Faulty heated oxygen sensor Heated oxygen sensor harness open or shorted Heated oxygen sensor circuit poor connection Troubleshooting P0059 NOTE #1: Bear in mind that the oxygen sensor itself forms part of the control circuit, which is why it must be tested along with the wiring when resistance tests are carried out. NOTE #2: Diagnosing code P0059 requires that the engine be in perfect running order, with no misfiring, rich-, or lean running conditions, or vacuum and exhaust leaks present that could influence the proper working of any oxygen sensor. If there are other codes present along with P0059, these codes must be resolved before starting a diagnostic procedure for code P0059. Step 1 Record all stored fault codes, along with all available freeze frame data. This information could be very helpful if an intermittent fault is diagnosed later on. Step 2 Perform a thorough visual inspection of all wiring associated with the affected sensor. Consult the manual to determine the function, color-coding, location, and routing of all wires in the circuit, and look for shorted, burnt, damaged, or broken wiring and connectors. Pay particular attention to the routing of the wiring, since unsecured and misrouted wiring can easily burn against hot exhaust components. Repair wiring and/or connectors as required, but be sure to route all wiring as far away from the exhaust system as possible. Step 3 If no visible damage to the wiring is found, perform continuity, resistance, ground, and reference voltage checks on all associated wiring. Consult the manual on the exact values required for the application being worked on, but be sure to disconnect the sensor from the PCM before starting continuity checks to prevent damage to the controller. Since code P0059 indicates a resistance issue, pay particular attention to the resistance values. If the circuit is fused, check the resistance in both the reference voltage and signal voltage wires; replace the wiring if obtained values do not fall within the manufacturer’s specifications. If the circuit is not fused, the PCM is supplying the reference voltage (and sometimes the ground as well) so consult the manual on the relevant pin number and location in the PCM connector. Check for continuity and resistance from this pin to the corresponding pin in the connector on the end of the wiring harness. Compare obtained readings with those stated in the manual, and replace the affected wiring if obtained values differ from those stated in the manual. At this point it also a good idea to confirm that the oxygen sensor reference voltage is the same as the battery voltage, i.e., 12.6V to 13.8V to eliminate battery and charging system issues as the cause of long warm-up times of oxygen sensor heater elements. Low input voltages may not always cause code P0059, but it is easy to misinterpret long warm-up times as resistance issues. NOTE: Avoid repairing wiring, since poorly executed repairs could cause high resistance and continuity issues later on. The better option is always to replace wiring, as opposed to repairing it. Step 4 If all electrical values fall within manufacturer’s specifications, or after repairs had been made, clear all codes and test the system again to see if the code returns. If it does return, it is almost certain that the sensor itself is defective. Remove the affected sensor from the exhaust system, and test its resistance. Note that the manual will state the exact resistance value, and the obtained reading must match this value exactly. Close enough is not good enough; oxygen sensors require a specific resistance to work properly, so replace the sensor if there is any doubt about its internal resistance. NOTE: Resist the temptation to replace the sensor with a cheap aftermarket part. These parts almost never conform to OEM specifications, meaning that not using OEM replacement sensors could cause a speedy recurrence of the problem. Step 5 If the sensor is replaced, clear all codes still present, and test drive the vehicle with a suitable scanner connected to monitor the operation of the sensor in real time. Note that during normal operation, the signal voltage will never be static; after the PCM enters closed loop operation, it will change continually from around 100 millivolts to about 900 millivolts, depending on the engine load and speed. However, assuming that no misfiring, vacuum, or exhaust issues are present, this fluctuation is dependent on both the resistance of the control circuit and the sensor itself, meaning that a persisting, or intermittent resistance issue could affect the signal voltage. Both high and low resistances could cause the heater element not to work properly, which will ultimately affect the signal voltages generated. Step 6 Note that intermittent problems can sometimes be extremely difficult to find and repair. In some cases, it may be necessary to allow the fault to worsen before an accurate diagnosis and definitive repair can be made. Searches related to P0059 p0059 gmc p0059 ford mustang ho2s heater resistance (bank 1 sensor 1) p0060 ford f150 code p0059 p0154 gmc p0155 code chevy p2197 ford f150
