Understanding P0135 on Your 2020 Santa Fe
Your 2020 Hyundai Santa Fe has triggered a P0135 diagnostic code, indicating a malfunction in the oxygen sensor heater circuit for Bank 1, Sensor 1. The 2020 Santa Fe offered the 2.4L four-cylinder (185 hp) or 2.0L turbo (235 hp). Both are inline engines with a single exhaust bank.
At 4-5 years old, your Santa Fe should still have Hyundai's excellent warranty coverage.
Symptoms
- Check engine light on
- Slightly reduced fuel economy
- Rough cold idle
- Emissions test failure
Common Causes
O2 Sensor Heater Element Wear
The heater element degrades from thermal cycling.
Connector Corrosion
Heat and road exposure cause corrosion.
Wiring Damage
Heat can damage wiring insulation.
Blown Fuse
Check the O2 heater fuse first.
Warranty Status
- Bumper-to-Bumper: 5yr/60k (likely still active)
- Powertrain: 10yr/100k
- Federal Emissions: 8yr/80k
This repair should be covered at no cost.
Repair Costs (If Out of Warranty)
- Dealer: $170-$300
- Independent shop: $140-$260
- DIY: $50-$120