OBD-II trouble code
P015A: O2 Sensor Delayed Response – Rich to Lean (Bank 1 Sensor 1)
Application matters: Nissan NTB18-047a covers listed 2018–2019 Rogue Sport J11/MR20DD vehicles with the specified code condition, no drivability issues and a matching current ECM part number. Ford’s separate directional-delay example does not supply Nissan repair criteria.
Bank 1 sensor 1 has a rich-to-lean delayed-response report. Preserve the exact direction and vehicle conditions; a matched Nissan calibration case shows why an automatic A/F-sensor purchase is premature.
Quick facts
- System
- Powertrain
- Category
- Emissions / Oxygen Sensor Response
- Severity
- Medium severity
- Driving guidance
- Depends on symptoms and vehicle guidance
- Repair cost range
- Get a vehicle-specific estimate after diagnosis.
- DIY difficulty
- Shop recommended
A code alone cannot establish whether driving is safe. Stop safely for a red brake or oil-pressure warning, overheating, severe misfire, stalling, or impaired braking or steering, and follow the owner's manual. Restraints faults can reduce crash protection even when the vehicle runs normally.
Browse every code in P0100–P0199, or start from the full code library.
What does P015A mean?
P015A reports delayed rich-to-lean response for bank 1 sensor 1. Retain the word delayed and the transition direction: it is not simply another name for every slow-response or rear-sensor report. The label alone does not establish that the air/fuel or oxygen sensor is the failed part.
Nissan NTB18-047a, dated December 3, 2019, documents one specific repair path on 2018–2019 Rogue Sport J11 vehicles with the MR20DD engine. It requires the listed A/F-sensor code condition and no drivability issues. The technician must also match the vehicle’s current ECM part number to the bulletin’s table before reprogramming applies.
An ECM number that does not match sends the vehicle back to further diagnosis. The bulletin likewise directs further diagnosis when no applicable reprogramming is available. This is a useful calibration-selection example, not permission to flash every vehicle with P015A or proof that every sensor and wire is physically healthy. The specified setup and confirmation are part of the matched repair.
Ford’s July 2024 gasoline summary provides different monitor context. Its bank 1 example separately evaluates rich-to-lean time delay and rich-to-lean slow response. Those criteria belong to the covered Ford monitor and should not be used as the Nissan diagnostic test. P015B concerns the opposite lean-to-rich delay direction on the same numbered bank/sensor subject.
Bring the original scan and recorded conditions to the repairer. A basic label, a current steady signal or the fact that the engine feels normal cannot alone choose the calibration or a part. Locate the actual bank 1 sensor 1 through vehicle information, with its correct sensor technology and circuit procedure.
Arrange professional assessment rather than deliberate deceleration, mixture changes or trial programming. Follow current warnings and stop safely for severe running trouble or a stop instruction. Obtain an itemized diagnosis and confirmed repair plan; a dated bulletin does not guarantee current coverage or a particular price.
Possible causes
- A calibration condition in the precisely matched Nissan bulletin case
- A different sensor, signal or operating-response fault demonstrated by the actual vehicle procedure
Symptoms
- P015A recorded with a malfunction indicator
- No drivability issues in the specifically qualified Nissan bulletin case
- Other running symptoms or companion faults that require assessment outside that limited example
Diagnostic steps
Save the full scan report, code status, and available freeze-frame data before clearing anything. Confirm the reporting module, any failure-type suffix, and the procedure for the exact vehicle. The steps below are an overview; use manufacturer specifications and safety procedures for testing.
- 1.Preserve the complete P015A report, status, companion faults and event data before anything is erased.
- 2.Have the actual bank 1 sensor 1 and rich-to-lean delay assessment identified for the vehicle.
- 3.For the cited Nissan example, verify J11/MR20DD model applicability, the no-drivability condition and the existing ECM part-number match.
- 4.If the update conditions do not match, have the applicable further diagnosis completed instead of buying a sensor or selecting a trial flash.
- 5.Leave programming, protected tests, required learning and confirmation to qualified service. Ask for the documented findings and complete repair scope.
Repair cost
Get a vehicle-specific estimate after diagnosis.
A trouble code alone does not price the repair. Ask the shop to identify the confirmed fault and itemize diagnosis, parts, labor, programming or calibration, and taxes.
Estimate your repair
Run the numbers for your vehicle
Open the Repair Cost Estimator with vehicle-specific fault and system diagnosis preselected. Adjust labor rate and vehicle category to fit your situation.
Related repairs
These links are planning examples; the code does not confirm that any listed part has failed.
DIY vs shop
A qualified shop is recommended because this can involve vehicle-specific emissions-system diagnosis and protected circuit or component tests, with pressure relief, exhaust cooling, fluid handling or setup when required by the installed system and confirmed repair. Ask the technician what testing confirmed the repair.