Can I replace a sensor myself?

Many sensor replacements are straightforward DIY repairs requiring basic tools. However, proper diagnosis is important to confirm the sensor is actually faulty before replacement.

How much does a sensor replacement cost?

Sensor costs range from $20-$150 for the part, with labor adding $50-$200 depending on accessibility. Some sensors in hard-to-reach locations may cost more in labor.

P0318

Rough Road Sensor "A" Signal Circuit

Lowsensor

Overview

The P0318 diagnostic trouble code means the PCM has identified a rough road sensor "a" signal circuit problem. This code indicates that a sensor or its circuit is not providing expected readings to the engine management system. Faulty sensor data can cause the PCM to make incorrect adjustments, affecting engine performance.

Symptoms

Erratic engine behavior
Check Engine Light (MIL) illuminated
Hard starting in certain conditions
Incorrect gauge readings

Common Causes

Incorrect sensor installed
Physical damage to sensor
Faulty PCM (Powertrain Control Module)
Poor ground connection for sensor

Diagnosis Steps

1Connect an OBD-II scanner and read all stored trouble codes and freeze frame data
2Locate the specific sensor referenced by the code
3Inspect the sensor connector for corrosion, damage, or loose pins
4Test the sensor output using a multimeter or scan tool live data
5Check the wiring between the sensor and the PCM for opens or shorts

Estimated Repair Cost

$75 — $350

Cost varies by vehicle, location, and repair shop. Includes parts and labor.

Commonly Affected Vehicles

Chevrolet CruzeToyota CorollaHonda CivicHyundai Elantra

Related Codes

P0100 P0110 P0130

More Sensor Codes

P0070Ambient Air Temperature Sensor Circuit

Low

P0071Ambient Air Temperature Sensor Range/Performance

Low

P0072Ambient Air Temperature Sensor Circuit Low

Low

P0073Ambient Air Temperature Sensor Circuit High

Low

P0074Ambient Air Temperature Sensor Circuit Intermittent

Low

P0095Intake Air Temperature Sensor 2 Circuit

Low

Frequently Asked Questions

Most automotive sensors last 80,000-150,000 miles, though this varies by sensor type and driving conditions. Oxygen sensors and temperature sensors tend to degrade gradually over time.