What is the P0060 Code?
The P0060 trouble code is a generic powertrain code. It indicates a malfunction in the heater circuit of the downstream oxygen sensor (lambda sensor) located after the catalytic converter (sensor 2) on the bank of cylinders that does not contain cylinder number 1 (bank 2). This issue can affect most OBD-II equipped vehicles (Chevrolet, Ford, GMC, Mazda, Pontiac, Isuzu, etc.), although specific diagnostic procedures may vary by make and model.
Function of the Lambda Sensor and Its Heater Circuit
The lambda sensor measures the proportion of oxygen in the exhaust gases. Its integrated heating element allows for rapid warm-up to ensure optimal operation, especially when cold. The Powertrain Control Module (PCM) continuously monitors the resistance of this heater circuit. The P0060 code is triggered when the measured resistance exceeds the programmed tolerance values in the PCM.
Symptoms of the P0060 Code
This fault is considered serious because it affects the air-fuel mixture, particularly during cold starts. Common symptoms include:
- Hard starting in cold weather
- Increased fuel consumption
- Black smoke from the exhaust (overly rich mixture)
- Illumination of the Malfunction Indicator Lamp (MIL)
- Possibility of related trouble codes
Possible Causes of the P0060 Fault
Several components can be the source of this code:
- Damaged wiring (chafing, burning, cutting) or an oxidized/disconnected connector
- The lambda sensor itself is faulty (heater element failure)
- A blown fuse or a faulty relay supplying the heater circuit
- A problem with the PCM (less common)
Diagnosis and Solutions for Resolving the P0060 Code
Preliminary Tip: Consult your manufacturer’s Technical Service Bulletins (TSBs). This might be a known issue with a specific correction procedure.
Recommended Diagnostic Steps:
- Visual Inspection: Meticulously examine the sensor’s wiring and connectors, especially sections exposed to heat (exhaust) or sharp edges.
- Checking Fuses and Relays: Test all fuses and the relay associated with the lambda sensor heater circuit with a multimeter, under load to avoid false positives.
- Using an OBD2 Scanner:
- Read and note all present trouble codes.
- Clear the codes and perform a road test to see if the P0060 returns immediately.
- On a cold engine, observe the scanner’s live data regarding the heater circuit status. The voltage should be close to battery voltage (≥12.6V).
- Electrical Tests with a Multimeter (DVOM):
- Measure voltage and continuity on the circuit.
- Measure the resistance of the lambda sensor’s heating element (refer to the manufacturer’s specifications). Always disconnect the connector before taking this measurement.
Note: A repeatedly blowing fuse typically indicates a short circuit in the heater circuit.
Conclusion and Call to Action
Diagnosing the P0060 code requires a methodical approach, starting with the simplest checks (fuses, wiring). If the problem persists after these checks, replacing the lambda sensor is often the solution.
Don’t feel comfortable performing these procedures? Entrust the diagnosis and repair of your vehicle to a certified professional. They have the necessary tools and expertise to resolve the issue effectively and guarantee the repairs.