Can I drive with P0135?

Yes, but drive carefully and get it checked soon. A sensor that helps set the fuel mixture is not warming up properly. The car usually runs, but fuel economy and emissions can get worse.

What does P0135 mean?

P0135 stands for O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1).

Symptoms you may notice

• Check engine light illuminated
• Slightly increased tailpipe emissions during the first 3 minutes of warm-up
• Normal engine performance once warmed up

How much does it cost to fix?

Repair costs for code P0135 depend on the specific underlying root cause, ranging from simple DIY checks to component replacement. The table below lists the most common causes and rough price ranges in USD:

• Burned out heater element inside the sensor
  $80-$210 common
• Blown oxygen sensor heater fuse
  $5-$15 common
• Corroded connector terminals
  $20-$60 possible
• Damaged wiring near the exhaust
  $40-$100 rare

What to do next

1. Check the under-hood fuse box for blown O2 sensor heater fuses.
2. Test resistance of the two heater wires on the sensor with a multimeter (normally 3-15 ohms).
3. Replace the upstream oxygen sensor if resistance reads infinite (open circuit).

Related codes

About this code

Code P0135 affects only the internal electric heating element designed to bring the oxygen sensor up to operating temperature (600°F) quickly after cold start. Once your engine has been running for 3 to 5 minutes, hot exhaust gases warm the sensor naturally, allowing it to function normally. You can drive without worry until you have time to replace the sensor.