P0136 on a 2022 Kia Sorento
Post-Cat O2 Sensor Circuit Fault (Bank 1)
P0136 on a 2022 Kia Sorento indicates post-cat o2 sensor circuit fault (bank 1). It usually stays drivable short-term but should be diagnosed promptly. The most common cause is failed bank 1 downstream o2 sensor (typically $150–$450). Confirm the root cause before replacing parts.
What does P0136 mean on a 2022 Kia Sorento?
P0136 is set when the ECM detects a general circuit fault on the Bank 1 downstream (post-catalyst) oxygen sensor. Unlike the more specific P0137 (low voltage), P0138 (high voltage), or P0140 (no activity), P0136 is the generic circuit code that covers wiring issues, intermittent connection problems, or signals that go outside expected ranges in a way that doesn't fit a more specific fault category.
This guide covers P0136 across the 2020-2024 Kia Sorento generation — the symptoms, causes, and diagnostic steps below apply to every model year from 2020 through 2024.
Is it safe to drive a 2022 Kia Sorento with P0136?
In most cases a 2022 Kia Sorento stays drivable for short trips with P0136 active, but diagnose and repair it promptly. This is a moderate-severity code — ignoring it can lead to further damage or a failed emissions test.
What are the symptoms of P0136 on a 2022 Kia Sorento?
- Check Engine Light is illuminated
- Catalyst readiness monitor will not complete
- Possible slight reduction in fuel economy
- Often no drivability symptoms
- Vehicle will fail emissions / smog testing
What causes P0136 on a 2022 Kia Sorento?
| Cause | Likelihood | Estimated repair (USD) |
|---|---|---|
| Failed Bank 1 downstream O2 sensor | Most common | $150–$450 |
| Damaged sensor wiring (chafed against exhaust) | Common | $80–$350 |
| Corroded O2 sensor connector | Common | $30–$200 |
| Exhaust leak upstream of the downstream sensor | Occasional | $100–$500 |
| Damaged or compressed sensor pigtail from a previous repair | Occasional | $80–$300 |
| Failed PCM input (rare) | Rare | $400–$1,500 |
How to diagnose this on a 2022 Kia Sorento
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Read all O2-related codes to refine the picture
P0136 alone is generic. With P0137 it points at low voltage specifically; with P0138 at high voltage; with P0140 at no activity at all; with P0141 at the heater. Cross-referencing tells you whether the diagnostic should target wiring, sensor element, or heater.
Tools: Scan tool with full code retrieval
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Inspect the sensor wiring
Trace the downstream sensor's harness from the sensor body back to the chassis connector. Look for melted insulation (from exhaust contact), chafing against suspension components, or rodent damage. Repair before replacing the sensor.
Tools: Flashlight, Inspection mirror, Wire repair supplies
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Test the sensor connector
Disconnect and inspect for water intrusion, corrosion, bent pins. Clean with electrical contact cleaner. The downstream connector sits under the vehicle and gets road spray; corrosion is common after a few salt-belt winters.
Tools: Electrical contact cleaner, Magnifying glass
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Graph the sensor signal
With engine warm and held at 2500 RPM, watch the Bank 1 downstream O2 voltage. A healthy sensor sits relatively steady around 0.6–0.8 V. Rapid switching, signal stuck at one value, or no signal at all confirms a sensor or wiring issue.
Tools: Scan tool with graphing PIDs
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Verify the bias voltage from the PCM
Disconnect the sensor and key on. The scan tool should still show bias voltage (typically 0.4–0.5 V) at the connector. If not present, the issue is between the connector and the PCM, not the sensor.
Tools: Scan tool, Multimeter
NHTSA complaints & recalls for the 2022 Kia Sorento
Owner-reported safety complaints and official recalls filed with the U.S. National Highway Traffic Safety Administration for the 2022 Kia Sorento. Use these to gauge how common a problem is on your specific vehicle before you start chasing Kia Sorento diagnostics.
- POWER TRAIN 57
- ENGINE 49
- UNKNOWN OR OTHER 36
- ELECTRICAL SYSTEM 26
- SERVICE BRAKES 17
6 active recalls
- ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER Mar 2022
Kia Motor America (Kia) is recalling certain 2022 Sorento vehicles. The oil supply pipe to the turbocharger may crack, which could result in an oil leak in the engine compartment.…
NHTSA campaign 22V202000 - TIRES:TEMPORARY/EMERGENCY SPARE TIRE Jul 2022
Kia Motors America (Kia) is recalling certain 2022 Sorento and Telluride vehicles. The vehicles may be equipped with an incorrect spare tire which, when installed, can impair the anti-lock braking system (ABS) and the traction control system (TCS). As such, these vehicles fail…
NHTSA campaign 22V509000 - TRAILER HITCHES Sep 2022
Kia America, Inc. (Kia) is recalling certain 2016-2022 Sorento, 2021-2022 Sorento Hybrid (HEV), 2022-2023 Sorento Plug-In Hybrid (PHEV), and 2017-2022 Sportage vehicles equipped with a tow hitch harness installed as original equipment, or purchased as an accessory through a Kia d…
NHTSA campaign 22V703000 - POWER TRAIN:AUTOMATIC TRANSMISSION Oct 2022
Kia Motors, Inc. (Kia) is recalling certain 2021-2022 Sorento and 2021-2023 K5 vehicles. The vehicle's "fail-safe" limited-mobility drive mode may be impaired, when prompted by a transmission oil pump malfunction, which can result in a complete loss of drive power.…
NHTSA campaign 22V760000
How do I fix P0136 on a 2022 Kia Sorento?
- Replace the Bank 1 downstream O2 sensor with an OEM part
- Repair damaged downstream sensor wiring
- Clean or replace corroded sensor connector
- Repair upstream exhaust leaks
About the 2020-2024 Kia Sorento
The 2020-2024 Kia Sorento was commonly sold with the following powertrains: 2.5L I4, 2.5L Turbo I4, 1.6L Turbo Hybrid I4, 1.6L Plug-in Hybrid I4. Common trims include LX, S, EX, SX, SX-Prestige, X-Line.
Why P0136 is the catch-all post-cat code
Each O2 sensor has a family of possible codes:
| Code | Meaning |
|---|---|
| P0136 | Generic circuit issue (catch-all) |
| P0137 | Voltage too low (open or short to ground) |
| P0138 | Voltage too high (short to power or rich condition) |
| P0140 | No activity detected (sensor isn’t reporting anything) |
| P0141 | Heater circuit fault |
When the ECM detects a problem that doesn’t fit the more specific patterns, it falls back to P0136. Reading other codes alongside narrows the diagnosis significantly — P0136 alone is much harder to pin down than P0136 + P0140.
What “downstream sensor” actually monitors
The Bank 1 downstream sensor is mounted in the exhaust after the catalytic converter on Bank 1 (the cylinder bank containing cylinder #1). Its main job is catalyst monitoring — comparing its signal to the upstream sensor’s signal to determine whether the catalyst is still scrubbing exhaust gases.
It provides a secondary, slower fuel-trim correction layer on top of upstream-sensor closed-loop control, but it is not the primary fuel feedback. A bad downstream sensor primarily affects emissions monitoring rather than drivability.
OEM vs aftermarket sensors
The downstream sensor’s role is comparison, not raw measurement, so it is slightly less picky about sensor response curve than the upstream. But aftermarket sensors still produce inconsistent results; for $30 more, an OEM Bosch, Denso, or NTK sensor is worth it on a vehicle you plan to keep.