P0426 OBD-II Trouble Code: Catalyst Temperature Sensor Range/Performance (Bank 1)

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

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0426 code

P0426 is a diagnostic trouble code (DTC) for "Catalyst Temperature Sensor Range/Performance (Bank 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 for $114.99 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.0 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 $114.99 $20.0
Toyota $114.99 $20.0
BMW $124.99 $20.0
SCHEDULE P0426 DIAGNOSTIC Get a fair and transparent estimate upfront

P0426 definition

A P0426 trouble code is related to one of a vehicle’s catalytic converters and the temperature range that is deemed normal by the manufacturer.

What the P0426 code means

P0426 is an OBD-II generic code for a threshold problem with a vehicle’s bank 1 catalytic converter. This is the part of the exhaust that helps reduce emissions for either the entire engine, or just the bank of cylinders that includes cylinder one. The engine computer rates its efficiency by way of the oxygen sensor. If the data being sent by the sensor to the computer is not within the manufacturer’s parameters, a check engine light is illuminated with a P0426 code.

What causes the P0426 code?

The most common causes for a P0426 are:

What are the symptoms of the P0426 code?

More often than not, a P0426 will simply result in a check engine light as it won’t take much for one to be triggered. In some cases, the catalytic converter can be physically damaged which would result in a lack of engine performance, stalling, and poor fuel mileage.

How does a mechanic diagnose the P0426 code?

Your mechanic will first visually inspect the catalytic converter and the oxygen sensors to ensure they seem to be in good condition and to rule out one or the other as a cause. A faulty catalytic converter will usually give itself away from an audible rattle when hit with a small hammer. If the oxygen sensor wiring appears damaged, the entire sensor may need to be replaced.

If the trouble code is present with no noticeable symptoms, the P0426 may be an intermittent code that could be dealt with by simply resetting the engine computer.

Common mistakes when diagnosing the P0426 code

While a P0426 does literally say “catalyst,” the catalytic converter is not always to blame. Because the oxygen sensor has to relay the data to the engine computer before it can confirm there’s a problem, a faulty sensor can cause a number of issues.

How serious is the P0426 code?

Unless a P0426 is causing adverse driving conditions associated with a faulty catalytic converter, most codes are no more serious than a “service engine soon” light. Even still, all problems should be investigated as quickly as possible to ensure no critical damage to the vehicle’s exhaust and emissions system.

What repairs can fix the P0426 code?

The most common repairs for a P0426 are as follows:

Additional comments for consideration regarding the P0426 code

P0426s are commonly associated with other trouble codes. If you do encounter multiple codes, always make sure to pay close attention to how they show up on an OBD-II scanner as the order can indicate what the actual route of the problem is.

Need help with a P0426 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.

OBD-II
trouble codes
P0426

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0426 code.

SCHEDULE P0426 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(7294)

Rating Summary
6779
246
57
39
173
6779
246
57
39
173
 at YourMechanic

Simon

30 years of experience
8 reviews
Simon
30 years of experience
Honda Element L4-2.4L - Check Engine Light is on Inspection - Albuquerque, New Mexico
Simon was Professional, knowledgeable and patient throughout the entire process. Would highly recommend!
 at YourMechanic

Luke

17 years of experience
134 reviews
Luke
17 years of experience
Chevrolet Equinox L4-2.4L - Check Engine Light is on - Austin, Texas
Luke was friendly and professional. He did a nice job of explaining the issue with my car so that I could understand it.
 at YourMechanic

Chuy

14 years of experience
386 reviews
Chuy
14 years of experience
Toyota Camry L4-2.5L - Check Engine Light is on - Chicago, Illinois
His explained everything very clearly on what I should do next with my car and what the cheapest solutions were.
 at YourMechanic

Jose

12 years of experience
31 reviews
Jose
12 years of experience
Chrysler Pacifica V6-3.8L - Check Engine Light is on - Redlands, California
Very friendly and punctual. Knows what he is talking about. Appreciate Jose working on my car. I would recommend him to customers.


More related articles

P0507 OBD-II Trouble Code: Idle Control System RPM Higher Than Expected
P0507 code definition P0507 is a generic OBD2 diagnostic trouble code (DTC) referencing a fault within the idle control system. This code...
P2035 OBD-II Trouble Code: Exhaust Gas Temperature (EGT) Sensor Circuit Low Voltage Bank 2 Sensor 2
P2035 P2035 code definition Exhaust Gas Temperature (EGT) Sensor Circuit Low Voltage Bank 2 Sensor 2 Bank 2 refers to the back of cylinders without the number one cylinder. Sensor 2 would be the second EGT sensor from the motor...
P2253 OBD-II Trouble Code: O2 (Oxygen) Sensor Negative Current Control Circuit High Bank1 Sensor 1
P2253 P2253 code definition O2 (Oxygen) Sensor Negative Current Control Circuit High Bank1 Sensor 1 What the P2253 code means P2253 is a generic OBD2 diagnostic trouble code (DTC) (https://www.yourmechanic.com/article/what-is-the-on-board-diagnostics-obd-system) indicating a fault with the bank 1 sensor 1 O2...

Related questions

Egr and evap codes 455 & 405

The trouble code P0405 (https://www.yourmechanic.com/article/p0405-obd-ii-trouble-code-exhaust-gas-recirculation-sensor-circuit-a-low-by-jay-safford) is for the EGR sensor. This code indicates that the sensor is not giving correct voltage readings. You'll need to replace the sensor and the sensor hoses. The hoses can clog or burn through which...

The Check Engine Light comes back on after I reset it

When the Check Engine Light comes on without any specific warning, this can indicate a variety of possible issues. Unfortunately, without more specific symptoms, this can be tough to diagnose without the use of a scanning tool and the skill...

OD2 scanner read trouble code P0101

Your computer may not be able to correctly interpret the data from the mass airflow sensor on your engine causing the P0101 (https://www.yourmechanic.com/article/-p0101-obd-ii-trouble-code-mass-airflow-maf-circuit-operating-range-or-performance-problem-by-john-nelson) code to keep returning. The manufacturer has a Technical Service Bulletin (https://www.yourmechanic.com/article/how-to-use-a-technical-service-bulletin-tsb-to-diagnose-and-repair-a-car-by-valerie-johnston) that came out January 30th...

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