Fault Family System: Powertrain (P-Codes) 2 SAE Codes

Fuel System Leak Detected

Diagnostic & Technical Explanation

Code P0093 (Fuel System Leak Detected - Large Leak) sets when the ECM's fuel system pressure-decay monitor detects a leak in the high-pressure fuel circuit larger than the calibrated threshold. Causes range from a loose or damaged high-pressure line fitting and a leaking injector seal to a cracked rail or a failing pump seal.

These 2 diagnostic trouble codes share one detection mechanism and one repair path, which is why MechanicDB groups them into a single authored fault family rather than repeating the same explanation 2 times.

Codes in this family (2)

Code	Definition	Repair coverage
P0093	Fuel System Leak Detected - Large Leak	3 ranked fixes
P0094	Fuel System Leak Detected - Small Leak	3 ranked fixes

What this page does not show

This page publishes the fault mechanism and the code index. The licensed dataset adds, for every one of the 15,886 codes, the full authored repair set (56,729 procedures in total) with the fields deliberately withheld here:

Procedures 2..n after the first-listed procedure
Aftermarket parts cost ranges in USD (est_parts_cost_min/max_usd)
Professional labor-hour estimates (est_labor_hours)
Step-by-step diagnostic and repair instructions
Replacement-part mappings and catalog lookups
6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)

Need All 15,886 Codes as Data?

Pipe-delimited CSV, Apache Parquet and a relational SQLite database, with commercial application rights and instant download. Built for scan tools, shop software and research - not assembled one web page at a time.

License OEM Complete · $149 Standard (SAE only) · $49

$49 Standard: 9,249 SAE codes · $149 OEM Complete: all 15,886 codes, including 6,637 OEM codes across 32 makes · $149 Heavy Duty: 4,212 fault pairs (J1939) · one-time · compare tiers