P0060 Heated Oxygen Sensor Heater (HO2S) Resistance Sensor Bank 2 Sensor 2

P0060 Heated Oxygen Sensor Heater (HO2S) Resistance Sensor Bank 2 Sensor 2

OBD-II DTC Datasheet

Oxygen sensor heater resistance (block 2, sensor 2)

What does this mean?

This Diagnostic Trouble Code (DTC) is a generic transmission code, which means it applies to all 1996 vehicles (Chevrolet, Ford, GMC, Mazda, Pontiac, Isuzu, etc.). Although general in nature, the specific repair steps may differ depending on the brand / model.

If your OBD-II equipped vehicle has stored a code P0060, it means that the powertrain control module (PCM) has detected a malfunction in the heater circuit of the lower (or pre-catalytic converter) oxygen (O2) sensor for the first row of engines. Bank 2 indicates that the problem is with an engine group that does not contain cylinder # 1. Sensor 2 means the problem is with the lower sensor.

The zirconia sensing element, protected by a vented steel housing, forms the body of your O2 sensor. Platinum electrodes are used to connect the sensing element to the wires in the O2 sensor wiring harness. The Controller Area Network (CAN) allows the PCM to receive data from the O2 sensor. The data concerning the percentage of oxygen particles in the engine exhaust compared to the oxygen content in the ambient air is transmitted to the PCM by the O2 sensor. The PCM uses this data to calculate fuel delivery and ignition timing.

The Heated O2 Sensor uses battery voltage as a preheat for cold start conditions. In a heated O2 sensor, the O2 sensor signal circuits are accompanied by a circuit to heat the sensor. The heater circuit is normally supplied with battery voltage (12.6 V minimum) and may be equipped with a built-in fuse. When the engine coolant temperature is low, the PCM takes steps to supply battery voltage to the O2 sensor heater. This should continue until the engine reaches normal operating temperature and the PCM enters closed loop mode. Voltage is usually supplied through the PCM, sometimes by relays and / or fuses, and is initiated when the ignition is turned on under cold start conditions. The PCM is programmed to stop supplying battery voltage to the O2 heater circuit as soon as the engine reaches normal operating temperature and must take action to do so.

If the PCM detects that the resistance level from the O2 sensor heater circuit exceeds the programmed limits, a P0060 code will be stored and a malfunction indicator lamp (MIL) may illuminate. Some models will require multiple ignition cycles (with failure) to illuminate the MIL. Because of this, you will need to use OBD-II ready mode to make sure your repair was successful. After you have completed the repairs, drive the vehicle until the PCM enters readiness mode or the code is cleared.

Severity and symptoms

The P0060 code should be considered serious as it means that the input O2 sensor heater is not working. Symptoms of this engine code may include:

• Delayed start due to lean cold start
• Reduced fuel efficiency
• Black exhaust smoke due to rich cold start state
• Other associated DTCs may also be stored.

reasons

Possible causes of DTC P0060 may include:

• Burnt, broken, or disconnected wiring and / or connectors
• Defective O2 sensor
• Blown fuse or blown fuse
• Defective engine control relay

Possible solutions

A good starting point is always to check the Technical Service Bulletins (TSB) for your particular vehicle. Your problem may be a known issue with a known manufacturer-released fix and could save you time and money while troubleshooting.

When diagnosing a P0060 code, I will need a diagnostic scanner, a digital volt ohm meter (DVOM), and a reliable source of vehicle information such as All Data DIY.

I like to start by visually inspecting the system's wiring harnesses and connectors; paying particular attention to belts routed near hot exhaust pipes and manifolds and belts routed near sharp edges, such as on exhaust shields.

I would continue to use DVOM to test all system fuses and fuses. I would test these components while they are under load, because unloaded fuses may appear to be OK; will then crash on boot. Activating the O2 sensor heaters effectively loads this circuit.

My next step would be to get all stored DTCs and freeze frame data. I would do this by connecting the scanner to the vehicle's diagnostic port. I like to write this information down as it can be helpful if the P0060 turns out to be intermittent. I would clear the codes and test drive the car to see if the P0060 resets immediately.

Make sure the engine is cold enough to activate the O2 sensor heater if the code is cleared. Observe the O2 sensor heater input using the scanner data stream and narrow down the data stream display to include only relevant data. This will result in faster data response. When the engine is in the correct temperature range, the O2 sensor heater voltage should be nearly the same as the battery voltage. If the O2 sensor heater voltage is different from the battery voltage due to a resistance problem, the value of P0060 will be stored.

To monitor real-time data from the O2 sensor heater circuit, connect the DVOM test leads to the sensor ground and battery voltage signal wires. The resistance of the O2 sensor in question can also be checked using the DVOM. All related controllers must be disconnected before testing the system circuit resistance with the DVOM.

Additional diagnostic tips and notes:

• If blown fuses are found, suspect that the O2 heater circuit in question is shorted to ground.
• The O2 sensor heater circuit must be energized when the engine temperature is below normal operating temperature.

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