P0038 on 2013-2016 Jaguar XF: HO2S Heater Circuit High Causes and Fixes

What's Unique About the 2013-2016 Jaguar XF

On the 2013-2016 Jaguar XF, P0038 is part of a pattern of heated oxygen sensor (HO2S) faults documented by Jaguar. Manufacturer Technical Service Bulletins (TSBs) group P0038 with a wide range of other HO2S codes, suggesting a common sensitivity or failure pattern in the emissions control system for this platform. [SSM72477, JTB-00392-NAS-3] TSB JTB-00392-NAS-3 specifically notes that the cause may be a 'post-catalyst heated oxygen sensor (HO2S) software error' and may require a PCM software update in addition to sensor replacement. Jaguar has also issued an extended warranty program for O2 sensors on many models from this era, including the XF with 3.0L and 5.0L engines, extending coverage to 10 years/120,000 miles or 15 years/150,000 miles depending on the engine.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.

Generation note: The 2013-2016 range covers the end of the first generation (X250, through 2015) and the start of the second generation (X260, beginning in 2016). The cited TSBs cover models up to 2016, suggesting the oxygen sensor issues may be common to both generations or at least the engines used across the transition. However, owners should verify parts based on their specific model year and VIN, as fuse box locations and part numbers can differ.

Symptoms You May Notice

• Check Engine Light is on.
• Vehicle fails an emissions test.
• Potentially reduced fuel economy.
• Rough idle during warm-up phase before the engine reaches operating temperature.

Most Likely Causes

1. Failed Bank 1, Sensor 2 Oxygen Sensor 🔴 High Probability The internal heater element within the oxygen sensor is a common failure point. Jaguar TSBs list numerous codes related to O2 sensor failures, indicating they are a frequent issue on this platform. [SSM72477, JTB-00392-NAS-3] TSB SSM72477 was specifically issued to investigate the root cause of these failures, noting that after diagnosis, the fault is often determined to be with the sensor itself.
   How to confirm: Disconnect the sensor and test the resistance across the two heater circuit pins (often the two same-colored wires) with a multimeter. A healthy sensor typically has a resistance between 2 and 30 ohms when cold. An open circuit (infinite resistance) or a reading of 0 ohms (short circuit) confirms the heater has failed 🎬 Watch: How to test if your O2 sensor heater is bad. and the sensor needs replacement.
   Typical fix: Replace the Bank 1, Sensor 2 oxygen sensor. This is the downstream sensor on the passenger side. After replacement, clear the DTCs. 🎬 See this walkthrough for replacing a Jaguar XF oxygen sensor. Per TSB JTB-00392-NAS-3, a PCM software update may also be required at a dealership.
   Est. part cost: $75-$300
2. Wiring or Connector Damage 🟡 Medium Probability The wiring harness is located under the vehicle and exposed to heat from the exhaust and road debris, which can cause wires to melt, chafe, or corrode. A forum user on JaguarForums.com noted that for multiple O2 sensor codes appearing at once, a wiring issue is a prime suspect, particularly where the harness may contact the hot exhaust.
   How to confirm: Visually inspect the wiring harness and connector leading to the sensor for any signs of melting, fraying, or corrosion. Check for a short to power on the heater control circuit wire. With the key on and engine off, use a multimeter to verify battery voltage (12V+) is present at the heater power pin on the harness-side connector.
   Typical fix: Repair the damaged section of the wiring harness and clean or replace the connector. Ensure repairs are protected with heat-resistant materials.
   Est. part cost: $10-$50
3. Blown Fuse ⚪ Low Probability
   How to confirm: Locate the fuse for the oxygen sensor heater circuit and check for continuity. On the XF (X250), there are multiple fuse boxes, including in the engine compartment, passenger footwell, and luggage compartment. A blown fuse 🎬 Watch: Find the exact fuse box locations for your XF. often points to a short circuit in the wiring or the sensor itself that must be fixed before replacing the fuse.
   Typical fix: Replace the blown fuse after diagnosing and fixing the underlying short circuit that caused it to blow.
   Est. part cost: $1-$5

Rare But Worth Checking

• Powertrain Control Module (PCM) Fault: This is very rare. TSB JTB-00392-NAS-3 does indicate a software error can be a cause, requiring a dealer reflash. However, a hardware fault in the PCM driver circuit is highly unlikely. Before suspecting the PCM, all other possibilities, including the sensor, wiring, and fuses, must be exhaustively ruled out.

Diagnosis Steps

1. Read the trouble code with an OBD-II scanner to confirm P0038 is present.
2. Visually inspect the Bank 1, Sensor 2 (downstream, passenger side) oxygen sensor, its connector, and wiring for any obvious signs of damage, melting, or corrosion.
3. Check the relevant fuse for the O2 heater circuit. This may be in the engine bay or passenger compartment fuse box.
4. Disconnect the sensor. Use a multimeter set to Ohms to measure the resistance of the heater circuit within the sensor itself (usually across the two wires of the same color). A reading between 2-30 Ohms is typical; infinite or zero Ohms indicates a failed sensor.
5. With the ignition on (engine off), check the harness-side connector. Use a multimeter to verify battery voltage (approx. 12V) on the power supply wire and check for a good ground on the corresponding pin.
6. If wiring, power, and ground are good, and the sensor's heater circuit resistance is out of spec, the sensor is bad.
7. Replace the Bank 1, Sensor 2 oxygen sensor. It is recommended to use a small packet of anti-seize compound on the threads if not already applied.
8. Clear the trouble code with the scanner. Inquire with a Jaguar dealer about TSB JTB-00392-NAS-3 to see if a PCM software update is also required for your vehicle's VIN.
9. Perform a drive cycle to ensure the repair was successful.

Parts You'll Likely Need

• Heated Oxygen Sensor (Bank 1, Sensor 2) (OEM #C2D23751 (Supersedes C2P8810, C2C22679 for some applications, verify with VIN). Another possible number cited in TSBs is C2D39892.) — This is the downstream (post-catalytic converter) sensor on the passenger side. The internal heater element is the most common point of failure for code P0038.
  Trusted brands: Bosch, Denso, NGK, NTK
  OEM price range: $230-$560
  Aftermarket price range: $75-$200

Technical Service Bulletins (TSBs) & Recalls

• SSM72477: Mentions P0038 in a list of heated oxygen sensor (HO2S) faults in the exhaust system. Notes the root cause was under investigation and asks technicians to retain failed parts for analysis.
• JTB-00392-NAS-3: Groups P0038 with other DTCs relevant to mid-catalyst and post-catalyst heated oxygen sensors. Crucially, it identifies the cause as a potential 'post-catalyst heated oxygen sensor (HO2S) software error' and instructs technicians to replace the sensor and then perform a PCM software update.
• JTB00392NAS1: An earlier version of the above TSB, also listing P0038 with other DTCs for mid and post-catalyst heated oxygen sensors and citing a software error as the potential cause.

Platform-Specific Known Issues

• Jaguar has issued multiple Technical Service Bulletins (TSBs) that include code P0038 among a long list of other oxygen sensor-related codes for this period, indicating a known pattern of faults. [SSM72477, JTB-00392-NAS-3, JTB00392NAS1]
• TSB JTB-00392-NAS-3 explicitly states that for a range of O2 sensor codes, including P0038, the cause may be a software error. The fix involves replacing the faulty sensor AND updating the PCM software.
• Jaguar has an extended warranty program (up to 15 years/150,000 miles for some engines) covering O2 sensor replacement for this vehicle generation. Owners should contact a dealer with their VIN to check for eligibility before paying for repairs.

Mechanic-Grade Diagnostic Values

• O2 Sensor Heater Element Resistance — expected: 2-30 Ohms (most sources cite 5-15 Ohms as a tighter, healthy range). Failure: 0 Ohms (short circuit) or infinite resistance / OL (open circuit)
• Voltage at Heater Power Pin (harness side) — expected: Battery Voltage (approx. 12-14.5V) with Key On, Engine Off. Failure: 0V or significantly lower than battery voltage, indicating a power supply issue (fuse, relay, wiring).
• Live Data - Heater Current Draw — expected: 0.5 - 1.5 Amps. Failure: Spikes greater than 2 Amps may indicate a shorted heater element.

Scan Tool Commands That Help

• Jaguar SDD (Symptom Driven Diagnostics): Datalogger / Live Data Monitoring — To monitor the live output and current draw of the oxygen sensors. SDD can show current draw in Amps, which can help identify faulty heater circuits that are drawing incorrect current.
• Jaguar SDD (Symptom Driven Diagnostics): Recommendations > Pinpoint Tests — After retrieving DTCs, SDD's guided diagnostics will provide specific pinpoint tests for the wiring and sensor integrity, which is more detailed than generic OBD-II procedures.
• Jaguar SDD (Symptom Driven Diagnostics): Configure existing module (PCM) — This function is required to perform the software update as specified in TSB JTB-00392-NAS-3 after replacing the faulty oxygen sensor.

Wiring & Ground Locations

• G1D120 — Right rear of engine compartment.. This is a primary ground point in the engine bay for the X250 platform and could be related to the engine control systems. A corroded or loose ground here can cause various electrical faults.
• G1D123 — Left rear of engine compartment.. Another primary engine bay ground point on the X250 platform. Ensuring its integrity is crucial when diagnosing any engine-related electrical DTC.
• Downstream Sensor Connector Color — On the wiring harness near the battery box or along the transmission tunnel.. On some Jaguar models (like the X-Type, which shares some design philosophy), downstream O2 sensor connectors are black, while upstream connectors are grey. This provides a quick visual check to ensure the correct sensor is being diagnosed.

Model Year Variations Within This Range

• 2013-2015 (X250) vs. 2016 (X260): The 2016 model year marked the introduction of the new X260 chassis, which is lighter and has a different interior and technology suite. While many engines (like the 3.0L V6) carried over, wiring harness routing, ground point locations, and module locations may differ. The X260 is known to have some different systemic issues, such as with the Ingenium engines not used in the earlier models. Technicians should always verify wiring diagrams and part numbers specific to the VIN to avoid confusion between the late X250 and early X260 models.