P0435 OBD-II Trouble Code: Catalyst Temperature Sensor Bank 2

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P0435 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0435 code

P0435 is a diagnostic trouble code (DTC) for "Catalyst Temperature Sensor Bank 2". 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 $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 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$70.00$30.00
Toyota$70.00$30.00
BMW$70.00$30.00
SCHEDULE P0435 DIAGNOSTIC Get a fair and transparent estimate upfront

Check Engine Light

P0435 code definition

This Diagnostic Trouble Code (DTC) is the generic code for Catalyst Temperature Sensor Bank 2, indicating that the problem originates from the engine bank which does not contain cylinder #1.

What the P0435 code means

In order to determine proper exhaust composition and temperature, the Powertrain Control Module (PCM) analyzes data sent from the oxygen sensors, using the data to calculate catalyst efficiency. If the signal sent to the PCM by the oxygen sensors falls outside of the expected parameters, the code will set.

What causes the P0435 code?

The most likely causes of this code are a faulty catalytic converter or bad oxygen sensors. Catalytic converters can fail due to:

  • Fuel in the exhaust system
  • Improper fuel usage
  • A faulty mass airflow (MAF) sensor
  • Fuel injector malfunction
  • A faulty fuel regulator
  • A coolant temperature sensor malfunction
  • A damaged or leaking flex hose
  • Faulty spark plug timing

What are the symptoms of the P0435 code?

The signs of this problem can range from just the stored DTC and a lit Check Engine Light, to engine stalling or a no-start condition. If faulty O2 sensors or a catalytic converter operating below the optimal efficiency threshold are the issue, you will probably still be able to drive the vehicle. If the catalytic converter is broken, however, you may experience poor engine performance, hissing noises, or the inability to start the vehicle.

How does a mechanic diagnose the P0435 code?

Diagnostic procedures could include:

  • Scanning the vehicle’s computer and capturing the data, including any concurrent codes
  • Clearing the DTCs and road testing the vehicle to ensure it’s not an intermittent condition
  • Measuring the temperature of the exhaust pipe before and after the catalytic converter, using a temperature gun (preferably equipped with a laser pointer)
  • Using a scanner and oscilloscope to monitor oxygen sensor function
  • Inspecting sensor wiring and connections
  • Visually inspecting the catalytic converter

Under normal conditions, when the engine has been test driven and is allowed to idle at normal operating temperature, the upstream O2 sensor should fluctuate quickly between .350 and .900 volts. The downstream sensor should stay around .500 volts. If these reactions are slower than expected, or nonexistent, the O2 sensors could be faulty. If the downstream sensor fluctuates close to the way the upstream sensor does, it could be a bad catalytic converter.

Common mistakes when diagnosing the P0435 code

The most common error is to replace the O2 sensors before verifying that they are malfunctioning. This is often done to try to avoid replacing the (expensive) catalytic converter; however, it may not solve the problem.

Another mistake is not addressing concurrent DTCs, which if left unchecked could trigger repeated catalytic converter failure.

How serious is the P0435 code?

The severity of this issue really depends upon the source of the problem. Catalytic converter failure may eventually affect engine performance, causing further damage. It can also cause problems with emissions testing if this is required in your state.

What repairs can fix the P0435 code?

Potential repairs include:

Additional comments for consideration regarding the P0435 code

It’s always advisable to diagnose and repair any other DTCs present along with the current issue, but it’s especially important in this case. There may be other O2 sensor, fuel mixture, fuel trim, or misfire codes and these should be addressed before assuming the repair is complete.

Due to the fact that the vehicle will likely need to be lifted in order to diagnose and repair P0435, your best bet is to have your car checked by a qualified technician who has the tools, equipment, and expertise to efficiently identify the problem and get you back on the road.

Need help with a P0435 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
P0435

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P0435 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.5/5

Number of Reviews

3,936

Rating Summary
3,597
169
44
25
101
3,597
169
44
25
101

Dia

29 years of experience
10 reviews
Dia
29 years of experience
He was on time, very knowledgeable.
2001 CHEVROLET S10 - CHECK ENGINE LIGHT IS ON - MORROW, GEORGIA

Joe

20 years of experience
44 reviews
Joe
20 years of experience
Joe is an honest mechanic and did a great job diagnosing my check engine light. He was very thorough explaining everything and recommending solutions. I will be using him again!
2005 INFINITI G35 - CHECK ENGINE LIGHT IS ON - IRVING, TEXAS

Cody

5 years of experience
40 reviews
Cody
5 years of experience
He is a great guy, he took time to diagnosed my truck and explained along what the issues was.
2007 FORD F-150 - CHECK ENGINE LIGHT IS ON - CROWLEY, TEXAS

Duane

22 years of experience
323 reviews
Duane
22 years of experience
Duane was really great, friendly and very helpful. I really appreciated his service.
2006 TOYOTA PRIUS - CHECK ENGINE LIGHT IS ON - CHULA VISTA, CALIFORNIA

More related articles

P0121 OBD-II Trouble Code: TPS "A" Circuit Range Performance Problem
P0121 code definition Throttle Pedal Position Sensor/Switch (TPS) A Circuit Range Performance Problem...
How to Buy Fuel Treatments
Adding a fuel additive to your gas tank when you fill up is one way to clean vital engine parts of deposits, improve the performance of your engine,...
How to Transfer a Car Title in Idaho
In order to prove ownership of a car, you must have the title. However, when a car is sold, given away or inherited, the title needs...

Related questions

Q: Is $2300 too much to pay to replace 2 cat converters for a 2007 Pathfinder?

Hello, thank you for writing in. Your particular make and model does utilize a catalytic converter on both sides of the engine. Catalytic converters are going to vary in price depending on the brand of replacement parts that you are...

Q: Engine died when I parked, as if it was turned off. It will turn over, but won't start. Could it be my MAF sensor?

Hi there. First check the transmission position sensor to see if the wiring harness has a short to ground or the sensor is failing. This sensor will cause the engine to shut off in the event that the computer...

Q: I have a 1986 Chrysler Laser turbo with 13700 miles that failed emissions. Do oxygen sensors go bad from sitting around too long?

Wow, I almost bought one of these new back in 1986. It is possible that due to age, any number of sensors can be bad, even without a Check Engine Light being set. The best way to determine that is...

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.

1-800-701-6230 · hi@yourmechanic.com