P0131 on the Final-Year 2023 Dodge Challenger
Your 2023 Dodge Challenger — the last model year for this legendary muscle car with internal combustion HEMI power — has set code P0131. This means the Bank 1 Sensor 1 oxygen sensor is reading below the expected voltage threshold. The 2023 Challenger is available with the 3.6L Pentastar V6, 5.7L HEMI V8, 6.4L HEMI V8 (Scat Pack), and the supercharged 6.2L HEMI in Hellcat, Redeye, and the limited-edition Demon 170 variants. On all of these, Bank 1 is the driver's side and Sensor 1 is the upstream pre-catalytic converter O2 sensor.
Symptoms
- Check engine light illuminated on the dashboard
- Reduced fuel economy — noticeable on already-thirsty HEMI models
- Subtle rough idle or minor vibration
- Throttle response may feel less crisp than normal
- Possible exhaust smell if Bank 1 runs overly rich to compensate
Why Your 2023 Challenger Has P0131
1. O2 Sensor Failure
On a vehicle this new, sensor failure is less common but still possible. The HEMI V8 exhaust temperatures are among the highest in the industry, and the upstream sensor at the manifold outlet bears the brunt. Factory sensor quality can vary, and contamination from engine break-in or fuel quality issues can degrade the sensing element early. The supercharged variants run even hotter exhaust temperatures, which compounds the stress.
2. Wiring or Assembly Defect
For a 2023 model, wiring damage is typically a manufacturing or assembly issue rather than wear. A connector that wasn't fully clicked in, a harness pinched between a heat shield and the frame, or a factory wiring routing error can all cause low signal voltage. Aftermarket modifications (headers, tunes, intakes) can also disturb the sensor circuit.
3. Exhaust Manifold Leak
Even on brand-new HEMIs, exhaust manifold issues can appear. Uneven torque on manifold bolts during assembly, a defective gasket, or a manifold casting flaw can create a leak that admits air past the sensor. This is a documented issue across the entire HEMI platform, affecting new and old vehicles alike.
4. Lean Fuel Condition
A genuine lean condition — from a vacuum leak, fuel delivery issue, or intake system problem — will cause the sensor to accurately read low voltage. On supercharged models, a boost leak at the intercooler piping or supercharger gasket can also introduce unmetered air. Look for P0171 as a companion code.
Diagnostic Steps
- Scan all DTCs and check for companion codes like P0171 (System Too Lean Bank 1).
- Monitor Bank 1 Sensor 1 voltage live — should cycle 0.1V to 0.9V at warm idle.
- On V8 models, compare Bank 1 and Bank 2 sensor outputs for asymmetry.
- Inspect the sensor connector — ensure it's fully seated with no bent pins.
- Check the exhaust manifold bolts and gaskets on the driver's side.
- On supercharged models, inspect boost piping and intercooler connections for leaks.
Repair Costs
This repair should be fully covered under the 3-year/36,000-mile bumper-to-bumper warranty and the 8-year/80,000-mile emissions warranty. Out-of-pocket, an OE sensor runs $80–$185, with $100–$200 in labor, totaling $180–$385. Manifold repairs on the HEMI run $500–$1,000.
Don't Wait
Since your 2023 Challenger is almost certainly under warranty, take it to the dealer promptly. There's no cost to you, and you'll preserve the performance and efficiency of what may become a collectible muscle car. Don't let a faulty O2 sensor compromise the catalytic converter on a vehicle that will only appreciate in value.