P0135 on Chevrolet
O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)
P0135 on Chevrolet vehicles indicates o2 sensor heater circuit malfunction (bank 1, sensor 1). Au7o has documented this code across 1 Chevrolet model — most commonly on Prizm. This code means the heater built into your upstream oxygen (O2) sensor on Bank 1, Sensor 1 — the sensor before the catalytic converter — isn't behaving as the engine computer expects. Modern O2 sensors have an internal heating element so they reach operating temperature quickly and can read the exhaust's oxygen content right after startup. When the computer detects that the heater circuit is open, shorted, or drawing the wrong amount of current, it sets P0135. A cold or slow-to-heat sensor delays accurate fuel mixture readings, which can hurt fuel economy and emissions. Typical repair costs on Chevrolet range from $100 to $300, depending on the specific model and root cause.
Common Causes of P0135
- •Failed O2 sensor heater element (most common)
- •Blown O2 sensor heater fuse
- •Corroded or loose O2 sensor connector
- •Damaged or melted wiring near the exhaust
- •Open or shorted heater control circuit
- •Poor ground or power supply to the sensor
- •Faulty PCM/ECM heater driver (rare)
P0135 on Chevrolet by Model
Chevrolet Prizm(1 issue)
- Oxygen Sensor Failure1998-2002
Oxygen sensors fail causing poor fuel economy and check engine light. Both upstream and downstream sensors prone to failure. Oil consumption issues accelerate sensor fouling.
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View P0135 across all makes →Frequently Asked Questions
What does P0135 mean on Chevrolet?▼
P0135 stands for "O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)." This code means the heater built into your upstream oxygen (O2) sensor on Bank 1, Sensor 1 — the sensor before the catalytic converter — isn't behaving as the engine computer expects. Modern O2 sensors have an internal heating element so they reach operating temperature quickly and can read the exhaust's oxygen content right after startup. When the computer detects that the heater circuit is open, shorted, or drawing the wrong amount of current, it sets P0135. A cold or slow-to-heat sensor delays accurate fuel mixture readings, which can hurt fuel economy and emissions. On Chevrolet specifically, this code is documented across 1 model.
What causes P0135 on Chevrolet vehicles?▼
Common causes on Chevrolet: Failed O2 sensor heater element (most common), Blown O2 sensor heater fuse, Corroded or loose O2 sensor connector, Damaged or melted wiring near the exhaust, Open or shorted heater control circuit. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0135 on a Chevrolet?▼
Repair costs on Chevrolet range from $100 to $300, depending on the specific model and root cause.
Which Chevrolet models have P0135 documented?▼
Au7o has documented P0135 on 1 Chevrolet model: Prizm.