OBD What's New
What changed, and when
This page logs every change to the site with the date it went live: new codes, new guides, new tools and fixes. Every code is checked against a public source before it ships, and a code that cannot be sourced does not go up.
Newest first.
This site today
- 9414 code pages, spanning the P, C, B and U families
- Every page carries the meaning, the common causes and the order to check, with a source recorded at build time
- 6 guides and reference pages, listed below
- Free to read, no signup, and no paywall anywhere on the site
Guides and reference
A new diagnostic-reference look across the site
October 18, 2026
Every page now reads like a service manual sheet: a reference rail down the left, a lookup box up top, and results as line items threaded by circuit traces. Code pages lay the answer out as findings, then the order to check them.
Search now reaches the words you use
October 18, 2026
Typing a symptom like catalyst, lean or misfire finds the codes behind it. Long result lists cap at 25 with one button to show the rest.
Some code pages are being rebuilt, and held out of search while they are
October 12, 2026
About 3,000 code pages were still built from one shared template, a code number dropped into the same paragraph. Those pages are now marked noindex. They still work if you land on one, but they are held out of search results until each gets a real source. As codes are sourced, the page is rewritten and returned to the index, so the indexed size of the site will move down before it moves back up.
Who runs this site, and where the data comes from
October 12, 2026
A new editorial standards page sets out who maintains the site, how every code is sourced, how AI is used in drafting, and how to report a correction. If a page is wrong, the fix and its source go up on that code.
Every code page rewritten with the cause list for that code
October 10, 2026
The hand-written pages went from 250 to 6,415. Every code a public source covers now carries causes and a check order written for that code instead of a shared category paragraph, each page adds where the fault lives and which lamp lights, and the code's own digits are explained on the page.
Severity now names the lamp that lights for that code
October 10, 2026
Codes that showed a severity label instead of a lamp were corrected to Check Engine Light, Body Warning Light, ABS Light, Chassis Warning Light or Airbag Light. Where a second independent publisher confirms a code, the entry says so.
Free code data, and reference pages you can print
September 29, 2026
The whole generic code list is downloadable as CSV or JSON, all 9,415 codes, free including commercial use. Two new reference pages went up with it: the OBD-II connector pinout and how a code is built. Everything here prints on one sheet. See it.
The embed box now matches your site
September 29, 2026
The free lookup box carries no styling of its own. It inherits your page font and takes your form CSS, so it looks like your own search box rather than like an advert. It also opens the lookup in a new tab, so you do not lose the reader. See it.
150 more codes and six new guides
September 26, 2026
Honda, Ford and Chevy each gained 50 codes. Six guides followed: Honda misfire codes and ABS and VSA lights, Ford PATS no-start and ABS and traction, Chevy security relearn and ABS and Stabilitrak.
Ford flash codes opened on the OBD-I hub
September 25, 2026
The pre-1996 hub now covers Ford EEC-IV as well as GM, 82 two-digit self-test codes with the key on engine off and running test procedures. See it.
Toyota grew by 98 codes
September 25, 2026
Toyota went from 198 to 296 codes across three batches, every one traced to a source before it shipped.
Severity now names the lamp that actually lights
September 25, 2026
Body and chassis faults used to say Check Engine Light. Airbag faults now say Airbag Light, brake faults say ABS Light, and the rest say body or chassis warning light, because that is what you see on the dash.
Five guides added across the network
September 25, 2026
How to read OBD-II codes, how to read OBD-I codes without a scanner, Ford fuel and ignition codes, Honda VTC and VTEC codes, and Chevy P1xxx fuel and ignition codes. Code pages that the guides cover now link to them.
Accuracy pass with sources
September 24, 2026
Every Toyota, Honda and Chevy code was checked against public references. Corrections landed on P1077, P1157, P1672, P1221 and B0414, and three Toyota entries came out because no source supported the meaning that was published.
Breadcrumbs on every site
September 20, 2026
Every code page now shows the path back, Home then make then code, with the make clickable on the OBD-I hub.
The OBD-I hub opened
September 19, 2026
A separate site for pre-1996 flash codes started with 68 GM codes, make landing pages, the paperclip procedure and a code reading guide. See it.
Search in the header of every page
September 19, 2026
The lookup moved into the header on all six sites, with a make dropdown so a reader can search the generic catalog or a brand catalog from any page.
Chevy site launched
September 13, 2026
Chevrolet, GMC, Buick and Cadillac codes got their own site, starting at 95 codes and growing from there.
Ford site launched
September 4, 2026
Ford, Lincoln and Mercury codes got their own site, 23 codes on day one and 99 within the same week.
Structured data and crawler access
August 30, 2026
Code pages started carrying breadcrumb, FAQ and article data so search engines can read the page structure, and the robots file opens the door to the major search and AI crawlers.
For site owners
Everything on this page is free to reuse. The code list comes as CSV or JSON, and the lookup box can be embedded in your own page: it matches your styling and opens in a new tab so you keep the reader (the embed page). All the tools are listed together on the tools page.