Diagnose Your Check Engine Light From Your Phone
When the Check Engine Light comes on, FIXD can communicate with your vehicle’s OBD-II system and retrieve supported engine diagnostic trouble codes.
Instead of showing only something like:
P0302
the FIXD app is designed to help explain what the code means and how serious the problem may be.
That can give you a much better starting point before you:
- Order parts
- Visit a repair shop
- Continue driving
- Attempt a DIY repair
Once FIXD retrieves a code, you can also use Pro Street’s DTC Doctor for a deeper diagnostic walkthrough:
https://my.prostreetonline.com/dtc-obdii/
Our P-Code library includes definitions, symptoms, causes and diagnostic procedures for common OBD-II faults:
https://my.prostreetonline.com/dtc-doctor/p-code-obd-ii-codes/
Read Thousands of Engine Fault Codes
FIXD’s current official product information states that the app can interpret thousands of engine-related diagnostic trouble codes.
FIXD marketing materials have used different totals over time, including references to more than 7,000 engine codes and much larger totals when broader issue databases are included.
For that reason, the most defensible way to describe the product is:
FIXD can identify and explain thousands of supported vehicle diagnostic issues.
Rather than focusing on a marketing number, the real benefit is that the scanner helps translate raw OBD-II trouble codes into information that is easier for the average driver to understand.
Official FIXD information:
https://www.fixdapp.com/features/
Understand How Serious a Fault May Be
One of FIXD’s most useful consumer-oriented features is:
issue severity.
According to FIXD, the app can help explain:
- What the detected problem means
- How serious it may be
- Potential consequences of continuing to drive
That can be more useful than simply displaying a five-character code with no context.
For example, a minor emissions-related fault and a severe misfire can both illuminate the same yellow Check Engine Light.
The scanner helps give you more information before deciding what to do next.
Clear Supported Check Engine Codes
FIXD allows users to clear supported engine trouble codes through the free app.
This may also turn off the:
Check Engine Light / MIL
after the underlying problem has been repaired.
However:
Clearing a trouble code does not fix the vehicle.
If the fault remains, the ECU can detect it again and the light may return.
Use the proper diagnostic sequence:
- Scan the code.
- Record the DTC.
- Diagnose the problem.
- Repair the fault.
- Clear the code.
- Verify that it does not return.
Don’t Clear Codes Before You Diagnose Them
Before pressing the clear button, write down the trouble codes.
Clearing codes can erase useful diagnostic information and can also reset emissions readiness monitors.
If you’re troubleshooting an intermittent problem, that information can be extremely valuable.
For additional OBD-II diagnostic help, visit:
https://my.prostreetonline.com/category/dtc-obdii/
Check Engine Codes Are Clues, Not Parts Lists
A scanner cannot automatically tell you which component needs replacement.
For example:
P0171 — System Too Lean Bank 1
does not automatically mean that the oxygen sensor has failed.
Possible causes can include:
- Vacuum leak
- Intake leak
- Low fuel pressure
- Dirty or faulty MAF sensor
- Fuel injector problem
- Exhaust leak
- Sensor wiring issue
See our P0171 guide:
https://my.prostreetonline.com/dtc-doctor/p0171-code-system-too-lean-bank-1/
Use the code as evidence.
Don’t use it as permission to fire the parts cannon.
Diagnose Misfire Codes
FIXD can also retrieve common misfire faults such as:
- P0300
- P0301
- P0302
- P0303
- P0304
- P0305
- P0306
- P0307
- P0308
A cylinder misfire may involve:
- Spark plugs
- Ignition coils
- Injectors
- Compression
- Vacuum leaks
- Fuel pressure
- Wiring
- Mechanical engine problems
The correct repair depends on diagnosis, not simply on which cylinder number appears in the code.
Browse Pro Street’s complete P-Code library:
https://my.prostreetonline.com/dtc-doctor/p-code-obd-ii-codes/
Free FIXD App
You do not need FIXD Premium just to perform basic diagnostics.
FIXD states that the free app works with the FIXD Sensor and provides core features such as:
- Reading engine trouble codes
- Clearing supported Check Engine codes
- Viewing issue severity
- Basic code explanations
- Maintenance information
- Maintenance reminders
- Multi-vehicle management
That makes the scanner useful even if you choose not to maintain a Premium subscription.
Official FIXD features:
https://www.fixdapp.com/features/
Optional FIXD Premium Features
FIXD also offers an optional paid service called:
FIXD Premium.
Premium features can include services such as:
- Repair-cost estimates
- Repair recommendations
- Mechanic support
- Additional repair information
- Emissions pre-check
- Additional vehicle ownership tools
Premium pricing and trial offers can change.
Review the current subscription terms directly through FIXD before activating a trial or paid membership:
Free Premium Trial Offers
Some FIXD packages include a:
14-day FIXD Premium trial.
Trial availability depends on the promotion or retailer.
FIXD has offered multiple pricing packages over time, so do not assume every sensor automatically includes identical Premium terms.
Check the exact offer bundled with your scanner before activation.
Manage Multiple Vehicles From One FIXD Account
FIXD supports multiple vehicles inside the app.
That makes it useful for:
- Families
- Multi-car households
- Enthusiasts with several cars
- Drivers managing a daily driver and project car
FIXD states that there is no fixed limit on the number of vehicles you can add and scan through your account.
You can move one sensor between compatible vehicles or install separate sensors in multiple cars.
Official setup guidance:
https://www.fixdapp.com/fixd-getting-started-guide/
Track Vehicle Maintenance
FIXD isn’t limited to Check Engine Light diagnostics.
The app also provides:
mileage-based maintenance information and reminders.
Depending on the vehicle profile, FIXD can help track recommended services and remind you when maintenance intervals approach.
This can help with common services such as:
- Oil changes
- Filters
- Fluid service
- Scheduled inspections
- Other mileage-based maintenance
For more automotive maintenance information:
https://my.prostreetonline.com/
Save Previous Vehicle Scans
FIXD can retain vehicle scan history in the app.
This can help you compare:
- Previous DTCs
- Recurring faults
- Vehicle condition over time
If a code disappears and later returns, having a scan history can provide useful diagnostic context.
Bluetooth Low Energy Connection
The FIXD Sensor communicates with compatible smartphones using:
Bluetooth Low Energy.
There are no diagnostic cables running from the OBD-II port to your phone.
The basic setup is straightforward:
- Download the FIXD app.
- Turn on Bluetooth.
- Start the vehicle as instructed.
- Plug the FIXD Sensor into the OBD-II port.
- Add your vehicle.
- Pair the sensor through the FIXD application.
- Run a scan.
FIXD OBD2 Scanner for iPhone
FIXD supports compatible:
- iPhone
- iPad
devices using the FIXD mobile app.
The scanner communicates through Bluetooth and displays diagnostic information directly on the mobile device.
Check the current App Store requirements to ensure compatibility with your specific iOS version.
FIXD OBD2 Scanner for Android
FIXD also supports compatible Android smartphones and tablets.
That makes the same sensor useful across common mobile platforms.
Android compatibility can vary by device and software version, so confirm current FIXD app requirements before purchasing.
What Vehicles Does FIXD Work With?
FIXD’s current prominent U.S. product information lists compatibility with:
gas-powered cars and trucks from 1996 and newer
and:
diesel vehicles from 2008 and newer.
FIXD has older compatibility pages that reference diesel vehicles after 2006, so diesel owners near that cutoff should verify their exact vehicle using FIXD’s current compatibility checker.
FIXD compatibility tool:
https://www.fixdapp.com/compatibility-test/
Does FIXD Work With Hybrid Vehicles?
FIXD documentation for newer products indicates support for compatible hybrid vehicles that use an OBD-II diagnostic system.
However, hybrid-specific module access and functionality can vary substantially.
Confirm the exact:
- Year
- Make
- Model
- Powertrain
before purchasing if your primary vehicle is a hybrid.
Does FIXD Work With Electric Cars?
Do not purchase the standard FIXD OBD-II Sensor expecting normal functionality on a full battery-electric vehicle.
FIXD’s standard scanner is primarily built around conventional OBD-II engine diagnostics.
A fully electric vehicle does not have the same engine/emissions system that generic OBD-II readers are designed around.
Is FIXD Universal?
No scanner should be marketed as literally universal.
Compatibility depends on:
- Model year
- Vehicle market
- OBD-II implementation
- ECU
- Fuel type
- Mobile device
For U.S. gasoline vehicles, 1996 and newer is the primary compatibility range.
Always verify unusual, imported, diesel or hybrid applications before purchasing.
Where Does FIXD Plug In?
FIXD plugs into the vehicle’s:
16-pin OBD-II diagnostic connector.
The connector is usually located:
- Under the driver’s dashboard
- Near the steering column
- Above the driver’s footwell
- Behind a small removable panel
FIXD also provides diagnostic-port location guidance through its app and website.
Compact Under-Dash Design
The sensor is intentionally compact.
Once installed in many vehicles, it can remain relatively unobtrusive underneath the dashboard.
This makes it convenient for drivers who want the sensor available whenever they need to run a scan.
However, any accessory connected to the OBD-II port consumes some electrical power.
For vehicles that sit unused for extended periods, disconnecting accessory devices can reduce the possibility of unnecessary battery drain.
Used-Car Inspection Tool
FIXD can also be helpful when inspecting a used vehicle.
A scan may identify:
- Stored Check Engine codes
- Pending engine faults
- Recently detected problems
- Vehicle scan history you create during ownership
When evaluating a used car, also check the emissions readiness status with an appropriate scan tool where available.
A recently cleared ECU may show several monitors as:
Not Ready.
That does not prove a seller intentionally erased codes, but it is a reason to investigate further.
Good Tool for First-Time DIY Diagnostics
FIXD is particularly well suited to people who find traditional scan tools intimidating.
Its app-focused approach emphasizes:
- Plain-language explanations
- Fault severity
- Maintenance information
- Repair guidance
- Phone-based operation
That lowers the barrier to learning what is happening inside the vehicle.
FIXD vs Generic Bluetooth OBD2 Adapter
Generic Bluetooth Adapter
Usually offers:
- Generic DTC reading
- Code clearing
- Live data
- Third-party app support
FIXD
Adds a more integrated ecosystem built around:
- Plain-language fault explanations
- Severity ratings
- Maintenance reminders
- Vehicle management
- Scan history
- Optional repair-cost and mechanic services
A generic adapter can be cheaper.
FIXD’s main advantage is the software experience built around the hardware.
FIXD vs Professional Scan Tool
FIXD should not be confused with a professional full-system diagnostic tablet.
Professional tools may provide deeper access to:
- ABS
- Airbag/SRS
- Transmission modules
- Body control modules
- Active tests
- Service resets
- ECU coding
- Key programming
- Bi-directional controls
FIXD is primarily aimed at consumer and DIY engine diagnostics.
Does FIXD Read ABS Codes?
Do not assume full ABS support from the standard FIXD Sensor.
Generic OBD-II is primarily standardized around:
engine and emissions diagnostics.
Some enhanced information may be available for certain vehicles and service levels, but ABS access should be verified for the exact vehicle before purchase.
Does FIXD Read Airbag Codes?
Likewise, SRS/airbag systems are not part of basic generic OBD-II engine diagnostics.
If your primary goal is diagnosing:
- Airbag
- ABS
- TPMS
- Body electronics
consider a scanner that explicitly guarantees those systems for your exact car.
Can FIXD Reset Maintenance Lights?
FIXD provides maintenance tracking and reminders, but that should not be confused with guaranteed electronic reset capability for every manufacturer-specific service light.
Oil-service resets and other manufacturer-specific service procedures may require:
- Vehicle controls
- A more advanced scanner
- Specific service software
depending on the application.
FIXD Can Help Validate a Repair
After completing a repair:
- Connect FIXD.
- Scan the vehicle.
- Clear the applicable supported code.
- Drive the vehicle normally.
- Scan again.
If the fault stays gone and the vehicle operates normally, that provides useful confirmation.
If the code returns, further diagnosis is required.
Check Emissions Readiness After Repairs
Clearing an emissions-related code usually resets OBD-II readiness monitors.
The vehicle may need to complete one or more drive cycles before the monitors become ready again.
For federal OBD and emissions information:
https://www.epa.gov/vehicle-and-fuel-emissions-testing
Do not simply clear a Check Engine Light immediately before a smog inspection.
Common Codes FIXD Can Help Identify
Examples of common OBD-II engine trouble codes include:
- P0171 — System too lean
- P0172 — System too rich
- P0300 — Random/multiple misfire
- P0301 — Cylinder 1 misfire
- P0302 — Cylinder 2 misfire
- P0420 — Catalyst efficiency below threshold
- P0440 — EVAP system malfunction
- P0507 — Idle control RPM higher than expected
- P0700 — Transmission control system malfunction notification
Use Pro Street’s DTC Doctor to move from code retrieval to actual troubleshooting:
https://my.prostreetonline.com/dtc-obdii/
FIXD and P0700
A scanner may retrieve:
P0700
when the transmission control system requests illumination of the Check Engine Light.
However, P0700 itself is not the actual internal transmission fault.
More advanced module access may be necessary to retrieve the underlying transmission-specific DTC.
Our P0700 guide explains the difference:
https://my.prostreetonline.com/dtc-doctor/p0700-code-transmission-control-system-malfunction/
Who Should Buy a FIXD Bluetooth Scanner?
FIXD makes sense for:
- Everyday drivers
- DIY mechanics
- New automotive enthusiasts
- Families with multiple vehicles
- Used-car shoppers
- Drivers who want simpler code explanations
- Owners who want maintenance reminders
- People who prefer smartphone diagnostics
Who Needs a More Advanced Scanner?
Consider a full-system scanner if you regularly need:
- ABS diagnostics
- SRS diagnostics
- TPMS service
- Electronic parking brake service
- Bidirectional tests
- ECU coding
- Key programming
- Manufacturer-specific resets
The FIXD Sensor’s strength is making everyday OBD-II engine diagnostics more approachable.
What’s Included?
Package contents depend on the retailer, but a standard listing should include:
1 × FIXD Bluetooth OBD2 Sensor
Access to the free FIXD app is available separately through compatible mobile-device app stores.
Any Premium trial should be described separately and according to the exact offer bundled with the product.
Shop Automotive Diagnostic Tools
Find additional automotive diagnostic tools, maintenance parts and vehicle accessories at:
Pro Street OBD-II Resources
Complete DTC Doctor
https://my.prostreetonline.com/dtc-obdii/
Complete P-Code Library
https://my.prostreetonline.com/dtc-doctor/p-code-obd-ii-codes/
OBD-II Diagnostic Articles
https://my.prostreetonline.com/category/dtc-obdii/
Most Common OBD2 Codes Explained
https://my.prostreetonline.com/2026/07/16/most-common-obd2-codes-explained/
Official FIXD Resources
FIXD Product and Features
https://www.fixdapp.com/features/
FIXD Vehicle Compatibility
https://www.fixdapp.com/compatibility-test/
FIXD FAQ
Final Take
The FIXD Bluetooth OBD2 Scanner is designed for drivers who want a simpler way to understand what their car is trying to tell them.
Plug the sensor into a compatible vehicle, connect with your iPhone or Android device, and use the free FIXD app to:
read Check Engine codes
clear supported faults
understand issue severity
track maintenance
manage multiple vehicles
and:
save diagnostic information.
The optional FIXD Premium service adds another layer of repair information and support, but the core scanner does not become useless without a paid membership.
That’s an important distinction.
FIXD’s biggest selling point isn’t that it replaces every professional scan tool.
It doesn’t.
Its advantage is that it takes OBD-II information that normally looks like:
P0302
and helps an everyday driver understand:
what happened, how serious it may be, and what to investigate next.
Once you have the code, continue your diagnosis with Pro Street’s DTC Doctor:
https://my.prostreetonline.com/dtc-obdii/
Because a five-character code is only the beginning of the repair.
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