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Guides

Short, checked articles on a car, an engine, a symptom or a code. Each one is tied to a specific vehicle and ends at the manual page that settles it.

What mechanics are asking about this month

Pencil sketch of a Mazda3 in a garage
Diagnostics & Repair

P0015 on a 2014-2016 Mazda3: Exhaust Cam Timing, Causes, Fix

JC Landry · Oct 30, 2026
Pencil sketch of a Nissan Pathfinder in a garage
Diagnostics & Repair

P0101 on a 2017-2020 Nissan Pathfinder: MAF Fault, Causes, Fix

JC Landry · Oct 27, 2026
Pencil sketch of a Toyota Camry in a garage
Diagnostics & Repair

P0171 on a 2018-2019 Toyota Camry 2.5L: Lean Code Causes and Fixes

JC Landry · Oct 30, 2026

Start with what the car is doing

All symptoms
Check engine light onLack of power or hesitationRough idleTransmission slippingShudder when acceleratingTransmission warning light onEngine hard to startEngine stallsTransmission won't engage or loses driveTemperature gauge in the red or reading high

All guides

5 guides matchClear filters
Pencil sketch of a Ram 1500 in a garage
Diagnostics & Repair

P0401 on a 2014-2018 Ram 1500 EcoDiesel: Low EGR Flow, Causes, Fix

Ram 1500 · JC Landry
Pencil sketch of a Subaru Forester in a garage
Diagnostics & Repair

P0420 on a 2014-2015 Subaru Forester 2.5L: Causes and Repair

Subaru Forester · JC Landry
Pencil sketch of a Ram 2500 in a garage
Diagnostics & Repair

P20EE on a 2017-2018 Ram 2500/3500 Cummins: SCR Fault, Causes, Fix

Ram 2500 · JC Landry
Pencil sketch of a Toyota Tundra in a garage
Diagnostics & Repair

P2440 and P2442 on a 2015-2016 Toyota Tundra: Causes and Repair

Toyota Tundra · JC Landry
Pencil sketch of a Toyota 4Runner in a garage
Diagnostics & Repair

P2445 and P2441 on a 2013-2015 Toyota 4Runner: Causes and Fixes

Toyota 4Runner · JC Landry

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Honda5 guidesNissan5 guidesFord3 guidesToyota3 guidesRam2 guidesMazda1 guide

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1.5T (L15BA)1 fitment · 2 guides1.5T (L15B7)2 fitments · 2 guides1.6L (HR16DE)2 fitments · 2 guides4.0L SOHC V6 (Cologne)9 fitments · 1 guide2.0L (Twin-Scroll EcoBoost 20)1 fitment · 1 guide1.5T (L15BE)1 fitment · 1 guide

Diagnostic codes asked about most

All codes
P0300Random/Multiple Cylinder Misfire Detected2 guidesP0172System too rich (bank 1)2 guidesP17F0CVT judder, transmission inspection2 guidesC1233Left Front Wheel Speed Sensor Signal Missing1 guideP0217Engine coolant overtemperature condition1 guideP0015Exhaust camshaft timing over-retarded, bank 11 guide

Use cases

All use cases
emanuals.ai for DIY owners: the manual your car came without, in plain language
Diagnostics & Repair

emanuals.ai for DIY owners: the manual your car came without, in plain language

JC Landry · Oct 29, 2026
emanuals.ai for independent shops: factory procedures for every make you see, without twelve subscriptions
Diagnostics & Repair

emanuals.ai for independent shops: factory procedures for every make you see, without twelve subscriptions

JC Landry · Oct 29, 2026
Silverado
Maintenance

emanuals.ai for fleet managers: maintenance schedules and known-issue bulletins across a mixed fleet

JC Landry · Oct 29, 2026
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Ask emanuals.ai about your car

Answers come from the factory manual for your make, model and year, with the page cited. Join the waitlist and we will email you when a spot opens up.