Free ASE L1 - Advanced Engine Performance Specialist Exam Questions and Answers
ASE L1 - Advanced Engine Performance Specialist is part of ASE certification tests from the National Institute for Automotive Service Excellence (ASE). ASE tests certify a technician in one specific repair speciality, are taken at Prometric centres or online with a proctor, and stay valid for five years.
The first 10 questions on this page are free to read, answers included — no account and no card. A plan opens the rest of the bank, the full timed practice test and your weak-topic reporting.
Last updated: August 29, 2026
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Question #1
A technician notices a vehicle has a rough idle and poor acceleration. Which parameter should be checked to diagnose the issue?
Please select an optionIncorrectCorrect answer: B
The Mass Air Flow (MAF) sensor plays a key role in controlling the air-fuel mixture. A faulty MAF can lead to rough idling and poor acceleration.
Was this answer correct?Question #2
After performing a compression test, the readings are low across all cylinders. What should be the technician's first step?
Please select an optionIncorrectCorrect answer: C
Before taking further action, it's essential to confirm that the compression test was performed correctly.
Was this answer correct?Question #3
A customer reports that their vehicle stalls intermittently. Upon scanning, a P0340 code appears. What is the most likely cause?
Please select an optionIncorrectCorrect answer: C
A P0340 code indicates a malfunction with the camshaft position sensor, which can cause stalling.
Was this answer correct?Question #4
During an emissions test, a vehicle fails due to high NOx emissions. Which component is most likely malfunctioning?
Please select an optionIncorrectCorrect answer: D
The Exhaust Gas Recirculation (EGR) valve reduces NOx emissions by recirculating some exhaust back into the intake; a malfunction can lead to increased NOx.
Was this answer correct?Question #5
After a tune-up, a vehicle has a noticeable decrease in fuel economy. What is the likely cause?
Please select an optionIncorrectCorrect answer: B
If spark plugs are misfiring, it can lead to inefficient combustion and thus decrease fuel economy.
Was this answer correct?Question #6
A scanner shows a P0171 code while performing a diagnostic on a vehicle. What does this code indicate?
Please select an optionIncorrectCorrect answer: D
A P0171 code indicates a lean condition, meaning there is too much air and not enough fuel in the combustion chamber.
Was this answer correct?Question #7
The technician connects a scan tool and finds multiple cylinder misfire codes. What is the first step in diagnosing this issue?
Please select an optionIncorrectCorrect answer: B
Checking for vacuum leaks is critical because it can affect the air-fuel mixture for all cylinders, leading to misfires.
Was this answer correct?Question #8
In a situation where the fuel gauge shows full, but the vehicle is stalling due to fuel starvation, what's most likely the cause?
Please select an optionIncorrectCorrect answer: D
A clogged fuel filter can restrict fuel flow and lead to symptoms of fuel starvation, despite the gauge indicating full.
Was this answer correct?Question #9
While diagnosing a no-start condition, the technician finds no spark at the spark plugs. What should be checked next?
Please select an optionIncorrectCorrect answer: D
A faulty crankshaft position sensor can prevent spark from being delivered to the plugs, leading to a no-start condition.
Was this answer correct?Question #10
A customer's vehicle vibrates excessively at idle but smooths out when driving. What could be the likely cause?
Please select an optionIncorrectCorrect answer: C
Worn or damaged engine mounts can allow excessive movement of the engine at idle, causing vibration.
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Other ASE certifications
- ASE P2 - Automobile Parts Specialist (opens in a new tab)
- ASE A4 - Suspension and Steering (opens in a new tab)
- ASE T3 - Drive Train (opens in a new tab)
- ASE T7 - Heating, Ventilation, and Air Conditioning (HVAC) (opens in a new tab)
- ASE L2 - Electronic Diesel Engine Diagnosis Specialist (opens in a new tab)
- ASE T4 - Brakes (opens in a new tab)
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FAQ
Learn More: https://apse.org/
- Q1: What is the ASE L1 - Advanced Engine Performance Specialist exam?
- A: ASE L1 - Advanced Engine Performance Specialist is a APSE certification exam. Judging by the questions in our bank, it concentrates on technician, vehicle, acceleration, fuel and engine.
- Q2: What topics does the ASE L1 - Advanced Engine Performance Specialist exam cover?
- A: Questions in our ASE L1 - Advanced Engine Performance Specialist bank cluster around technician, vehicle, acceleration, fuel, engine, brake, checked and code. Working through the full set is the quickest way to find which of these you are weakest on.
- Q3: How should I prepare for ASE L1 - Advanced Engine Performance Specialist?
- A: Work through the ASE L1 - Advanced Engine Performance Specialist practice questions here, checking your answer on each one, then sit the practice test to rehearse the exam under timed conditions before the real thing.
- Q4: Are these real ASE L1 - Advanced Engine Performance Specialist exam questions?
- A: They are drawn from officially released past questions and from community members who have sat ASE L1 - Advanced Engine Performance Specialist. Answers are verified and updated weekly.
- Q5: Where do I register for the ASE L1 - Advanced Engine Performance Specialist exam?
- A: Register through APSE directly at https://apse.org/. Exampractice is not affiliated with APSE and does not administer the exam.
- Q6: Is there a free ASE L1 - Advanced Engine Performance Specialist sample?
- A: Yes. Every ASE L1 - Advanced Engine Performance Specialist page shows a free sample of real questions. Upgrading opens the full bank and the practice test.
- Q7: What are APSE Certification Exams?
- A: APSE (Association of Professional Sales Engineers) Certification Exams validate your expertise in sales engineering, demonstrating your skills in technical sales, customer relationship management, and effective communication of complex technical solutions.
- Q8: Why should I pursue APSE Certification?
- A: APSE Certification enhances your professional credibility, showcasing your proficiency in sales engineering. This can lead to better job opportunities, higher salaries, and career advancement in the technical sales and engineering fields.
- Q9: What are the benefits of APSE Certification?
- A: Benefits include recognition as a certified sales engineer, improved job performance, access to exclusive resources, continuing education opportunities, and the ability to stay current with the latest industry trends and best practices.
- Q10: Who should take APSE Certification Exams?
- A: Sales engineers, technical sales professionals, account managers, and anyone involved in selling technical products or solutions should consider these certifications to validate their expertise and advance their careers.
- Q11: What types of APSE Certification Exams are available?
- A: APSE offers various certification paths, including Certified Professional Sales Engineer (CPSE) and other specialized certifications tailored to different aspects of sales engineering and technical sales.
- Q12: How do I prepare for APSE Certification Exams?
- A: Preparation can include official APSE training courses, study guides, practice exams, online tutorials, and hands-on experience in sales engineering and technical sales.
- Q13: Where can I take APSE Certification Exams?
- A: APSE Certification Exams can be taken online or at authorized testing centers, providing flexibility to fit your schedule and location.
- Q14: How do APSE Certifications impact my career?
- A: APSE Certifications significantly boost your career by demonstrating your expertise to employers, making you a more competitive candidate for advanced roles and promotions in technical sales and engineering.
- Q15: Are there any prerequisites for APSE Certification Exams?
- A: Some exams may have prerequisites, such as foundational knowledge or prior certifications. Check the specific requirements for each certification path on the APSE website.
- Q16: How often do I need to recertify for APSE Certifications?
- A: APSE Certifications typically require continuing education and recertification every three years to ensure that certified professionals stay updated with the latest industry practices and standards.