What Does Engine Code P0135 Mean?

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If your car shows a P0135 engine code, then the powertrain control module has detected a short in the circuit or too much resistance in the heater circuit. This occurs after this component tests the upstream heated oxygen sensor’s heater circuit in Bank 1.
Diagnostic trouble codes (DTC) play an important role in identifying and notifying issues with a car’s vital systems. All drivers should understand the basics of what these engine codes mean to make sure their car is well maintained and safe to drive.
Car insurance comparison and broker app Jerry is here to provide all the expert information you need about DTCs, and then help you get the best deal on car insurance. Here, we’ll explore the P0410 engine code: what it means, how to repair it, and roughly how much it will cost to fix.
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What does the engine code P0135 mean?

Definition: O2 sensor heater circuit malfunction Bank 1 Sensor 1
The P0315 engine code alerts you that the powertrain control module has performed the necessary tests on the upstream heated oxygen sensor’s heater circuit on Bank 1, and found either excessive resistance or a short in the circuit in the heater circuit

How much will it cost to fix?

The repair cost for this issue depends on what needs to be fixed. There are usually a few options. Here are what they cost, including parts and labor:
  • Oxygen sensor: $200-$300
  • Fuse: $5
  • Wiring repair/replacement: $100-$1,000

What can cause the P0135 engine code?

A vital part of an operating engine is that the heated oxygen sensors have heating elements to aid them in reaching operating temperature quickly. This works to minimize how long it spends in open-loop operation.
The P0315 engine code signals that a short in the circuit or excessive resistance has been detected in the heater circuit
The common causes behind the P0315 engine code include:
  • Faulty heated oxygen sensor (H2OS) bank 1 sensor 1
  • Heated oxygen sensor (H2OS) bank 1 sensor 1 circuit fuse
  • Heated oxygen sensor (H2OS) bank 1 sensor 1 circuit open shorted to ground
  • Heated oxygen sensor (H2OS) bank 1 sensor 1 circuit poor electrical connection
  • Faulty engine control module (ECM)

Common symptoms of the P0135 engine code

The P0315 engine code may trigger one or both of these actions:
  • Engine light on (service engine soon warning light)
  • Higher than usual fuel consumption
You may also find that your engine is running more roughly than usual. 

How serious is the P0135 engine code?

This is one DTC that does not require immediate attention. That said, it’s better to repair it or visit your mechanic to avoid it worsening, which could result in costlier repairs down the road.

Can I fix the P0135 engine code myself?

If you’re knowledgeable and comfortable with advanced auto repair, then you can fix this problem yourself. You may need to:
  • Clear the fault codes and drive the car to confirm the issue by seeing if the check engine light turns on again. If it does, then proceed to the next steps.
  • Inspect if the O2 sensor is receiving battery voltage with a multimeter. 
  • Disconnect the harness connector and turn the ignition to the ON position (careful not to crank the car). 
  • With a multimeter, test the O2 sensor for the right amount of voltage. If there’s no power, it’s recommended to check the fuse.
  • Inspect the electrical connections, wire harness, and metal tabs in terminals for any damages. If you find some damage, you should replace O2 Sensor – Clear code
  • Inspect the engine ground for corrosion and/or loose connections. If either is present, you should remove the corrosion and/or tighten and restart the diagnostic process.
  • If all of these tests are fine then you should replace the bank 1 sensor 1 O2 sensor.*

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