AutoCodes – Mazda – P0185 Mazda

P0185 Mazda Code - Fuel Temperature Sensor B Circuit Malfunction

Quick Answer

The fuel tank temperature sensor is used to detect the fuel temperature inside the fuel tank. Common causes include Faulty Fuel Temperature Sensor, Fuel Temperature Sensor harness is open or shorted, Fuel Temperature Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0185 Mazda indicates Fuel Temperature Sensor B Circuit Malfunction.
Common causes
Common causes include Faulty Fuel Temperature Sensor, Fuel Temperature Sensor harness is open or shorted, Fuel Temperature Sensor circuit poor electrical connection.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code Popularity 3,939
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Jun 14, 2020
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Code P0185 Mazda Description

The fuel tank temperature sensor is used to detect the fuel temperature inside the fuel tank. The sensor modifies a voltage signal from the Engine Control Module (ECM). The modified signal returns to the ECM as the fuel temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.
OBDII Code P0185 Mazda - Fuel Temperature Sensor B Circuit Malfunction - AutoCodes.com
P0185 Mazda Code - Fuel Temperature Sensor B Circuit Malfunction

What are the Possible Causes of the DTC P0185 Mazda?

  • Faulty Fuel Temperature Sensor
  • Fuel Temperature Sensor harness is open or shorted
  • Fuel Temperature Sensor circuit poor electrical connection

How to Fix the DTC P0185 Mazda?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

Code Tech Notes

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0185 Mazda code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0185 Mazda code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0185 Mazda Code

What does the OBDII code P0185 mean on a Mazda?

P0185 indicates a malfunction in the Fuel Temperature Sensor B Circuit, meaning the engine control module (ECM) is receiving an invalid or intermittent signal from the sensor.

What are the common symptoms of code P0185 in a Mazda?

Symptoms may include the check engine light turning on, poor fuel efficiency, rough idling, difficulty starting, or noticeable engine performance issues.

What causes a P0185 code to appear on a Mazda?

Common causes include a faulty fuel temperature sensor, damaged or corroded wiring, loose electrical connections, or a malfunctioning ECM.

Can I drive my Mazda with a P0185 code?

While the car may still be drivable, ignoring the issue can lead to reduced fuel efficiency, engine performance problems, and potential long-term damage. Addressing the issue promptly is recommended.

How do I diagnose a P0185 code on a Mazda?

Diagnosis involves using an OBDII scanner to confirm the code, visually inspecting the fuel temperature sensor and its wiring, and testing the sensor's resistance or voltage with a multimeter.

How do you fix the P0185 code on a Mazda?

Repairs may involve replacing the faulty fuel temperature sensor, repairing damaged wiring or connectors, or, in rare cases, replacing the ECM if it's determined to be the issue.

Where is the fuel temperature sensor B located on a Mazda?

The fuel temperature sensor is typically located near the fuel rail or integrated into the fuel pump assembly, depending on the specific Mazda model.

What tools are needed to fix a P0185 code on a Mazda?

Common tools include an OBDII scanner, a multimeter, basic hand tools for removing and replacing components, and possibly a wiring repair kit.

Can a dirty fuel filter cause a P0185 code in a Mazda?

A dirty fuel filter is unlikely to directly cause a P0185 code, but it can contribute to fuel system issues that might indirectly affect sensor readings.

How much does it cost to repair a P0185 code on a Mazda?

Repair costs vary but typically range from $100 to $300, depending on whether the issue is with the sensor, wiring, or other components. Labor costs may add to the expense.

Discuss the causes and fixes for P0185 Mazda OBDII Code

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