P0549 OBD-II Trouble Code: Exhaust Gas Temperature Sensor Circuit High Bank 2 Sensor 1

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0549 code

P0549 is a diagnostic trouble code (DTC) for "Exhaust Gas Temperature Sensor Circuit High Bank 2 Sensor 1". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P0549 DIAGNOSTIC Get a fair and transparent estimate upfront

P0549 Code Definition

The P0549 code is a generic powertrain code related to vehicle speed controls and idle control system problems. In this case, the engine control module (ECM) has found a fault with the exhaust gas temperature sensor circuit, receiving higher than normal voltage signals in bank 2 sensor 1.

Codes related to the P0549 include: * P0547: Exhaust Gas Temp. Sensor Circuit (Bank 2) * P0548: Exhaust Gas Temp. Sensor Circuit Low (Bank 2) * P2034: Exhaust Gas Temp. Sensor Circuit (Bank 2 Sensor 2) * P2035: Exhaust Gas Temp. Sensor Circuit Low (Bank 2 Sensor 2) * P2036: Exhaust Gas Temp. Sensor Circuit High (Bank 2 Sensor 2) * P2082: Exhaust Gas Temp. Sensor Circuit Range/Performance (Bank 2 Sensor 1) * P2083: Exhaust Gas Temp. Sensor Circuit Intermittent (Bank 2 Sensor 1) * P2086: Exhaust Gas Temp. Sensor Circuit Range/Performance (Bank 2 Sensor 2) * P2087: Exhaust Gas Temp. Sensor Circuit Intermittent (Bank 2 Sensor 2)

What the P0549 Code Means

A P0549 code is stored when the exhaust gas temperature sensor registers a high voltage from the bank 2 sensor on the exhaust gas temperature sensor (the side of the engine that does not contain Cylinder 1).

A vehicle’s exhaust gas temperature sensor is most commonly a two-wire sensor. It is a heat sensitive resistor, which converts exhaust temperature to a voltage signal read by the ECM. The sensor is located upstream from the catalytic converter. In a diesel engine, the exhaust gas temperature sensor is going to be most frequently located by the diesel particulate filter (DPF). The exhaust gas temperature sensor is solely responsible for protecting a catalytic converter from excessive heat damage.

The sensor is sent a 5-volt signal from the ECM from one wire, while the second wire is ground. If the signal is higher than 5-volts, a P0549 code is stored, signaling higher than normal exhaust gas temperatures.

What Causes the P0549 Code?

Several problems may cause a P0549 code including: * Damaged or defective exhaust gas temperature sensor * Open or shorted exhaust gas temperature sensor harness * Missing insulation that may cause a short directly to ground * Damaged, faulty, loose, or poor electrical connection to exhaust gas temperature sensor * Use of an aftermarket off-road exhaust system may cause a decrease in pressure * Exhaust leak upstream from exhaust temperature sensor * Damaged or defective ECM (rare)

What are the Symptoms of the P0549 Code?

Symptoms of a P0549 code may include: * Check engine or warning light may illuminate * There may be no symptoms other than a stored P0549 code

How Does a Mechanic Diagnose the P0549 Code?

A mechanic may use several methods to diagnose a P0549 trouble code, including: * Utilize an OBD-II scanner to check for a stored P0549 trouble code * Locate the exhaust gas temperature sensor, which will vary in location depending on whether the model is a gasoline or diesel (sensors in a gasoline model will be between the exhaust manifold and converter, sensors in a diesel model will be located before the DPF) * Locate the specific Bank (in this case, bank 2), which will be on the side of the engine that does not contain Cylinder 1 * Visually inspect the sensor and related circuitry for visible signs of damage, including missing insulation or bare wiring * Remove the exhaust gas temperature sensor and use a digital volt/ohmmeter to check resistance; approximate 150 ohms is the goal * Check voltage on engine side of the pigtail, if 5 volts is not found, the ECM may need to be replaced

Common Mistakes when Diagnosing the P0549 Code

The oxygen sensor may be incorrectly identified as the culprit of the P0549 code, when the true problem is the exhaust gas temperature sensor.

How Serious is the P0549 Code?

Because a vehicle’s safe driving operation most likely will not be impacted due to faults that store a P0549 code, this code is not considered a potentially serious code. When this code appears, it is recommended to take your vehicle to your local service center or mechanic for repair and diagnosis as soon as possible.

What Repairs can Fix the P0549 Code?

Several repairs can fix a P0549 trouble code and include: * Repair any damaged or shorted, open, or loose wiring or connectors * Replace the damaged or defective exhaust gas temperature sensor * Replace or repair the exhaust system, depending on whether aftermarket parts were used or parts may have been removed * Replace a damaged or defective ECM (rare) * Clear all codes, test-drive the vehicle, and rescan to see if any codes reappear

Additional Comments for Consideration Regarding the P0549 Code

This code is frequently found on vehicles with aftermarket exhaust systems, or a catback system. In addition, it is recommended to ensure that any aftermarket system utilized on your vehicle is fully compliant with state emissions laws and regulations.

Need Help with a P0549 Code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

trouble codes
Check Engine Light
P0549

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0549 code.

SCHEDULE P0549 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(6,180)

Rating Summary
5,718
221
51
35
155
5,718
221
51
35
155

Angelo

10 years of experience
3 reviews
Angelo
10 years of experience
Lexus RX350 - Check Engine Light is on - Nashville, Tennessee
Angelo was great!! Communicated with me really well and often, and made sure I fully understood the problem and how he fixed it. Highly recommend!!

JOHNNY

33 years of experience
73 reviews
JOHNNY
33 years of experience
Toyota Camry - Check Engine Light is on - Sacramento, California
He was very fast with his work and kept me informed about everything he did i would recomend him to a friend

Casey

19 years of experience
29 reviews
Casey
19 years of experience
Ford Fusion - Check Engine Light is on - Katy, Texas
Casey was super great, he spent a good amount of time doing a thorough investigation to make sure he diagnosed the issue with my car correctly and gave me sound advice. He also spent time explaining to me what the problem was which was much appreciated.

Matthew

33 years of experience
1001 reviews
Matthew
33 years of experience
Ford Expedition - Check Engine Light is on - Hampton, Virginia
As always, he's never late, very professional, has never went pass the estimated time, goes above and beyond and he breaks it down and explains everything so that you know exactly what he did and what needs to be done. Always satisfied with his work.


More related articles

P2574 OBD-II Trouble Code: Direct Ozone Reduction Catalyst Deterioration Sensor Circuit Low4
P2574 code means the degree of ozone reduction for each catalytic converter is not where it should be due to oxygen or pressure sensors.
P2522 OBD-II Trouble Code: A/C Request B Circuit
P2522 means a there is a problem from the air conditioning refrigerant pressure sensor which may be caused by low refrigerant in the A/C system.
P2563 OBD-II Trouble Code: Turbocharger Boost Control Position Sensor Circuit Range/Performance
P2563 code definition Turbocharger Boost Control Position Sensor Circuit Range/Performance What the P2563 code means P2563 is an OBD-II generic code. The...

Related questions

Engine knock and low engine power

Hi there: The problem with trying to diagnose a ticking issue remotely is the fact that it could be multiple; yet completely different mechanical systems that are causing this issue; ranging from the timing chain being loose, to fuel system...

It threw a code 21 , throttle position sensor bad code. i replaced it and the code went away but i still have no spark.

Hello and thank you for contacting YourMechanic. The problems that you are encountering with your vehicle, could be caused by the harness to the Throttle Position Sensor (TPS) or the computer itself. Check the harness to the TPS for any...

Code P0320 200 Mercury Cougar 2.0l

Hello. A no spark condition can be caused by many things. If the aforementioned components have already been replaced I would move on to looking at the ignition module, and perhaps the wiring to a few specific components. The ignition...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com