P0198 OBD-II Trouble Code: Engine Oil Temperature (EOT) Sensor High

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

SCHEDULE P0198 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0198 code

P0198 is a diagnostic trouble code (DTC) for "Engine Oil Temperature (EOT) Sensor High". 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 P0198 DIAGNOSTIC Get a fair and transparent estimate upfront

Check Engine Light

P0198 code definition

Engine Oil Temperature (EOT) Sensor High

What the P0198 code means

This code indicates there is higher voltage than expected in one or all of the circuits involving the EOT system (low oil engine temperature).

What causes the P0198 code?

  • Short to power in the EOT circuit
  • Faulty powertrain control module (PCM)
  • Low engine oil temperature

What are the symptoms of the P0198 code?

The only symptom is the Check Engine Light. The EOT system is there to detect other problems with the vehicle. If the circuits of the EOT system have problems, it will be unable to monitor the oil temperature.

How does a mechanic diagnose the P0198 code?

This code most likely indicates a short to power in the EOT electrical system. A scan tool should be used to observe sensor data to confirm this condition. Direct testing of the EOT circuits with a multimeter should performed to pinpoint the source of the short to power.

Each section of wiring should be isolated and tested to determine where the short to power is. This is followed by carefully inspecting the wiring harness for damage. Often, it is necessary to wiggle the suspected harness while observing the scan tool or multimeter watching for a change in voltage.

Common mistakes when diagnosing the P0198 code

  • A technician can choose to replace the sensor without checking the wiring going to and from the EOT sensor.
  • Failing to check the reference voltage the PCM/ECM provides to the sensor.
  • Failing to detect other problems that may contribute to low oil temperature.

How serious is the P0198 code?

This code is not likely to cause a vehicle to break down. However, there is some potential for this to occur. Anytime a PCM has full voltage (12.6 - 14.5 volts) applied to circuits that were designed for lower voltage, damage can occur. Fortunately, most modern vehicles have designed these systems to resist such damage in the event that a higher than expected voltage should occur.

What repairs can fix the P0198 code?

  • Repairing damaged wiring supplying the short to power
  • PCM repair
  • Addressing the low engine oil temperature

Additional comments for consideration regarding the P0198 code

A P0198 code is a generic code that all manufacturers can use and must always retain the same definition.

Each manufacturer utilizes a different diagnostic method for the testing of this system. Even then, it is often used in performance vehicles that are designed to be driven very hard. Driving in racing conditions pushes the vehicle to the limits of its engineering beyond what an everyday driver will experience. For this reason, an EOT system is not common on most vehicles.

Need help with a P0198 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.

Check Engine Light
trouble codes
P0198

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

SCHEDULE P0198 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

3,788

Rating Summary
3,460
163
43
24
98
3,460
163
43
24
98

Chris

19 years of experience
1277 reviews
Chris
19 years of experience
A True professional and very knowledgeable
2013 MERCEDES-BENZ C250 - CHECK ENGINE LIGHT IS ON - WILDOMAR, CALIFORNIA

Richard

18 years of experience
451 reviews
Richard
18 years of experience
Richard is very knowledgeable. He identified the exact problem and adjusted the ticket accordingly. He explained everything very well.
2003 FORD WINDSTAR - CHECK ENGINE LIGHT IS ON - FAYETTEVILLE, GEORGIA

Dan

36 years of experience
611 reviews
Dan
36 years of experience
Dan is the best mechanic in the business.
2004 NISSAN 350Z - CHECK ENGINE LIGHT IS ON - DULUTH, GEORGIA

Martin

26 years of experience
165 reviews
Martin
26 years of experience
Great mechanic, really cares about his clients
2007 MITSUBISHI ECLIPSE - CHECK ENGINE LIGHT IS ON - NASHVILLE, TENNESSEE

More related articles

How to Get a Louisiana Driver's Permit
s licensing program. The first step in this program is to obtain...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
Auto Safety Tips
Driving is more than a way to get from point A to point B. Owning and driving a car can also be a highly enjoyable experience. Whether a person is driving...

Related questions

Q: Car started to slow down and then the check engine light, battery, and engine oil light came on. What could cause this?

Hi there. It is possible that the battery cable came loose or the wires to the oil pressure sensor has came loose or failed. Check the battery cables and make sure that the terminals are tight and clean. Check the...

Q: Why after changing the power steering pressure sensor I still get the check engine light stating sensor failure?

When you scanned the computer and got a code for the power steering pressure switch, it did not necessarily mean to simply replace the sensor to fix the code. The code you got directs you to a pinpoint test that...

Q: My check engine light is on , mechanic said it is catalyst converter however the car run perfectly fine , no misfire or more

The impact on engine operation (and fuel efficiency) of a "failed" catalytic converter depends on exactly what the failure mode was. In one scenario, if the catalyst within the converter is simply "poisoned" and thus there is no longer any...

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