P3459 OBD-II Trouble Code: TP, MAP, or MAF Sensors

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

SCHEDULE P3459 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P3459 code

P3459 is a diagnostic trouble code (DTC) for "TP, MAP, or MAF Sensors". 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 P3459 DIAGNOSTIC Get a fair and transparent estimate upfront

Check Engine Light

P3459 code definition

The P349 code reflects that there is a problem with your vehicle’s TP, MAP, or MAF sensors.

What the P3459 code means

The control module in your vehicle is responsible for making sure that your ride is as safe, smooth and efficient as possible, even carrying out certain processes in service of this without letting you know.

One method of doing this is called cylinder deactivation mode. Basically, your vehicle is able to store a range of calculated values that would be enough to switch from V8 to V4 mode – again, without ever having to bother you.

The reason your vehicle does this is to increase fuel efficiency. Under light load conditions, your vehicle simply doesn’t need all eight cylinders – or all the gas they entail – to get the job done. So if the path ahead gets easier, special valve filters will stop intake and exhaust valves on certain cylinders from opening. All of this happens within milliseconds!

Unfortunately, sometimes, it should happen, but it doesn’t. When P3459 is stored, it’s because cylinders one and seven on the left bank and four and six on the right bank aren’t being shut down as they should, meaning your vehicle never enters V4 mode.

What causes the P3459 code?

There are actually a number of reasons that could contribute to the P3459 code being stored:

  • A defective cylinder deactivation solenoid
  • A cylinder deactivation solenoid harness is either open or shorted
  • A cylinder deactivation solenoid circuit has incurred a poor electrical connection
  • A problem with the engine’s mechanics
  • Low oil pressure
  • Something blocking the oil

What are the symptoms of the P3459 code?

There are really only a couple of symptoms that you may notice if your vehicle’s PCM has stored the P3459 code. First, you’ll probably see the Check Engine Light come on.

The other symptom you may take note of is that your vehicle’s fuel economy begins to suffer. This one is tough, though, because you may not use cylinder deactivation mode that much, meaning your fuel economy wouldn’t hurt by a lot either. However, by not being able to lay off extraneous cylinders, most of you will feel it at the pump a bit.

How does a mechanic diagnose the P3459 code?

A qualified mechanic will begin their diagnosis by using a scanner to confirm all the codes your PCM has stored. This will include the details regarding P3459. They’ll then inspect your vehicle’s cylinders and move onto the TP, MAF and MAF sensors. Your mechanic will also want to examine whether or not oil is able to transfer freely without issue.

Common mistakes when diagnosing the P3459 code

Again, one of the biggest mistakes with diagnosing the P3459 code is simply that it’s so easy to miss the problem in the first place. You may not even know it was a problem until you bring your vehicle in for some other reason.

This is why it’s a good idea to keep an eye on the MPG you generally get and take note if it begins changing unexpectedly. One possible explanation would be that your vehicle can’t shift to V4 mode when it would be prudent.

How serious is the P3459 code?

The problems related to the P3459 code definitely aren’t the kind that could damage your vehicle or put your life at risk. As we mentioned already, what it will do is end up costing you at the pump, so it’s probably worth having a professional fix it for you.

What repairs can fix the P3459 code?

Given that it’s a pretty simple problem, your mechanic shouldn’t have to do too much to fix it. They should only have to do one of the following:

Additional comments for consideration regarding the P3459 code

The problems that cause P3459 should serve as a good reminder to always take your vehicle to a qualified mechanic when you see the Check Engine light, even if it seems like nothing is wrong.

Need help with a P3459 code?

YourMechanic can have a certified mobile mechanic to your home or office right away if your vehicle is suffering. Just call us at 1-800-701-6230 or complete our online form here and you’ll receive a free quote with your appointment.

P3459
trouble codes
Check Engine Light

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

SCHEDULE P3459 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

3,484

Rating Summary
3,176
153
40
23
92
3,176
153
40
23
92

Richard

10 years of experience
415 reviews
Richard
10 years of experience
This is the second time I’ve had Richard work on my car. He always does an outstanding job and is quick, knowledgeable and professional. Highly recommended!!
2012 DODGE CHALLENGER - CHECK ENGINE LIGHT IS ON - LAS VEGAS, NEVADA

Michael

13 years of experience
372 reviews
Michael
13 years of experience
Mike was an absolute professional when he arrived. He walked me thru the whole process of my repairs and also made good recommendations for preventive issues. His mechanical knowledge and good customer services was a breath of air and greatly appreciated :-)
2007 CHEVROLET AVALANCHE - CHECK ENGINE LIGHT IS ON INSPECTION - MARIETTA, GEORGIA

Rodrigo

10 years of experience
85 reviews
Rodrigo
10 years of experience
Rodrigo was exactly on time, very professional and friendly. He assessed my car, let me know the exact problem when a previous mechanic from a shop in my area was unable to. I felt he was very honest and sincere letting me know the level of urgency that I deal with the issue. Absolutely no pressure. I will absolutely use Rodrigo the next time I need anything to do with my car and will tell everyone about him. This is such a great service, I will never go to another mechanic again. It is so convenient. I couldn’t be happier. :)
2013 SMART FORTWO - CHECK ENGINE LIGHT IS ON - LAS VEGAS, NEVADA

Ricardo

8 years of experience
223 reviews
Ricardo
8 years of experience
Great service and was very helpful on what maintenance my vehicle needed and what to expect in the future. Would definitely recommend to anyone and will.
2004 MITSUBISHI LANCER - CHECK ENGINE LIGHT IS ON - LOS ANGELES, 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...
Insurance Requirements for Car Registration in Kentucky
The Kentucky Transportation Cabinet requires that all drivers in Kentucky carry liability automotive insurance, or “financial responsibility” in order to operate a vehicle legally and maintain vehicle...
Veteran and Military Driver Laws and Benefits in New Mexico
The state of New Mexico offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch...

Related questions

Q: Q: Engine problems.

Hello. From what you describe it would appear likely that the backfiring and performance issues are a result of the fuel problem. A rich fuel mixture can be caused by a wide variety of issues. A few things I would...

Q: Car is running sluggish and the engine light is on.

Hi there. Check the ECM (computer) for any active or pending codes that are contributing to the engine light being on. This will give you a location to start with for diagnosing your vehicle and why it is running sluggish....

Q: My Mitsubishi Lancer 2005 has a limp mode issue - the car does not erase trouble codes permanently (even by debugging or terminal disconnection)

I see the note where you have previously replaced several components on the transmission already. Do you recall the brand and warranty of these components? If the parts you replaced are still under warranty, you may be able to get...

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