diff --git a/packages/core/src/seed.js b/packages/core/src/seed.js
index db77863..1e601a1 100644
--- a/packages/core/src/seed.js
+++ b/packages/core/src/seed.js
@@ -809,6 +809,132 @@ export const DEFAULT_FEEDS = [
     name: 'Makes, models and years',
     query: { kinds: ['model'] },
   },
+  /*
+   * The same automotive data indexed by the PART that failed rather than
+   * by the vehicle it was bolted to.
+   *
+   * There is no free car-parts catalogue with year/make/model fitment --
+   * ACES/VCdb and TecDoc are both subscription, and eBay's Browse API is
+   * the only free source of real fitment, which this deployment cannot
+   * use. What IS free and already flowing is NHTSA's component taxonomy,
+   * which goes down to the individual fastener ('SUSPENSION:FRONT:
+   * SPRINGS:LEAF SPRING ASSEMBLY:U-BOLT, LEAF SPRING TO AXLE').
+   *
+   * So these are feeds, not a new source: the adapter already slugifies
+   * Component into tags, and nothing needs to be fetched again. Every tag
+   * below was checked against the live API before being written down.
+   *
+   * Two of them look misspelt and are not. `slugify` drops "/" instead of
+   * turning it into a hyphen, so a component containing one collapses into a
+   * single run-on word: LATCHES/LOCKS/LINKAGES is `latcheslockslinkages` and
+   * VISIBILITY/WIPER is `visibilitywiper`. The hyphenated spellings match
+   * nothing. Changing slugify would be the real fix, but it would silently
+   * re-tag every adapter in the deployment and orphan the tags already
+   * written, so the feeds use what is actually in the data.
+   */
+  {
+    collection: 'automotive',
+    slug: 'parts-brakes',
+    name: 'Brakes',
+    description:
+      'Braking recalls and complaints across every manufacturer: hydraulic, air and parking brakes.',
+    /* Recalls and complaints together: a recall is the manufacturer
+       admitting it, a complaint is an owner noticing first. */
+    query: {
+      kinds: ['recall', 'complaint'],
+      tags: ['service-brakes-hydraulic', 'service-brakes-air', 'parking-brake'],
+    },
+  },
+  {
+    collection: 'automotive',
+    slug: 'parts-airbags',
+    name: 'Airbags and restraints',
+    description: 'The restraint system: airbags, inflators, seat belts and child seats.',
+    /* Recalls and complaints together: a recall is the manufacturer
+       admitting it, a complaint is an owner noticing first. */
+    query: { kinds: ['recall', 'complaint'], tags: ['air-bags', 'seat-belts', 'child-seat'] },
+  },
+  {
+    collection: 'automotive',
+    slug: 'parts-tires-and-wheels',
+    name: 'Tires and wheels',
+    description:
+      'Tire and wheel recalls, including the tire-only campaigns that never name a vehicle.',
+    /* Recalls and complaints together: a recall is the manufacturer
+       admitting it, a complaint is an owner noticing first. */
+    query: { kinds: ['recall', 'complaint'], tags: ['tires', 'wheels'] },
+  },
+  {
+    collection: 'automotive',
+    slug: 'parts-electrical',
+    name: 'Electrical system',
+    description:
+      'Wiring, charging, control modules and lighting — the largest single component category.',
+    /* Recalls and complaints together: a recall is the manufacturer
+       admitting it, a complaint is an owner noticing first. */
+    query: { kinds: ['recall', 'complaint'], tags: ['electrical-system', 'exterior-lighting'] },
+  },
+  {
+    collection: 'automotive',
+    slug: 'parts-fuel-system',
+    name: 'Fuel system',
+    description: 'Pumps, lines, tanks and injection, where a defect usually means a fire risk.',
+    /* Recalls and complaints together: a recall is the manufacturer
+       admitting it, a complaint is an owner noticing first. */
+    query: {
+      kinds: ['recall', 'complaint'],
+      tags: ['fuel-system-gasoline', 'fuel-system-diesel', 'fuel-system-other'],
+    },
+  },
+  {
+    collection: 'automotive',
+    slug: 'parts-engine-and-powertrain',
+    name: 'Engine and powertrain',
+    description: 'Engine, cooling, transmission, driveline and axles.',
+    /* Recalls and complaints together: a recall is the manufacturer
+       admitting it, a complaint is an owner noticing first. */
+    query: {
+      kinds: ['recall', 'complaint'],
+      tags: ['engine', 'power-train', 'engine-and-engine-cooling'],
+    },
+  },
+  {
+    collection: 'automotive',
+    slug: 'parts-steering-and-suspension',
+    name: 'Steering and suspension',
+    description: 'Steering gear, columns, springs, control arms and the fasteners holding them on.',
+    /* Recalls and complaints together: a recall is the manufacturer
+       admitting it, a complaint is an owner noticing first. */
+    query: { kinds: ['recall', 'complaint'], tags: ['steering', 'suspension'] },
+  },
+  {
+    collection: 'automotive',
+    slug: 'parts-structure-and-body',
+    name: 'Structure and body',
+    description: 'Frame, body, latches and locks.',
+    /* Recalls and complaints together: a recall is the manufacturer
+       admitting it, a complaint is an owner noticing first. */
+    query: { kinds: ['recall', 'complaint'], tags: ['structure', 'latcheslockslinkages'] },
+  },
+  {
+    collection: 'automotive',
+    slug: 'parts-visibility',
+    name: 'Glass, mirrors and wipers',
+    description: 'Windshields, mirrors, defrosters and wiper systems.',
+    /* Recalls and complaints together: a recall is the manufacturer
+       admitting it, a complaint is an owner noticing first. */
+    query: { kinds: ['recall', 'complaint'], tags: ['visibilitywiper', 'visibility'] },
+  },
+  {
+    collection: 'automotive',
+    slug: 'parts-equipment',
+    name: 'Equipment and aftermarket parts',
+    description:
+      'Recalls filed against a part rather than a vehicle: aftermarket equipment, cameras and accessories.',
+    /* Recalls and complaints together: a recall is the manufacturer
+       admitting it, a complaint is an owner noticing first. */
+    query: { kinds: ['recall', 'complaint'], tags: ['equipment', 'back-over-prevention'] },
+  },
   /* Markets. The first two are the worldwide half and the rest are US, which
      is the shape of what is actually given away: the register of the world's
      venues is public, and their prices are not. */
diff --git a/test/automotive-part-feeds.test.js b/test/automotive-part-feeds.test.js
new file mode 100644
index 0000000..2d09c7e
--- /dev/null
+++ b/test/automotive-part-feeds.test.js
@@ -0,0 +1,92 @@
+import { describe, expect, test } from 'bun:test';
+import { slugify } from '../packages/core/src/adapter.js';
+
+process.env.DATABASE_URL ??= 'postgres://test:test@localhost:5432/test';
+process.env.SITE_URL ??= 'https://nichedb.test';
+const { DEFAULT_FEEDS } = await import('../packages/core/src/seed.js');
+
+const partFeeds = DEFAULT_FEEDS.filter(
+  (f) => f.collection === 'automotive' && f.slug.startsWith('parts-'),
+);
+
+describe('the automotive collection, indexed by the part that failed', () => {
+  test('there is a feed per major component group', () => {
+    expect(partFeeds.length).toBeGreaterThanOrEqual(10);
+    const slugs = partFeeds.map((f) => f.slug);
+    for (const expected of [
+      'parts-brakes',
+      'parts-airbags',
+      'parts-tires-and-wheels',
+      'parts-electrical',
+      'parts-fuel-system',
+      'parts-engine-and-powertrain',
+      'parts-steering-and-suspension',
+    ]) {
+      expect(slugs).toContain(expected);
+    }
+  });
+
+  test('every part feed carries both recalls and complaints', () => {
+    // A recall is the manufacturer admitting it; a complaint is an owner
+    // noticing first. A feed with only one of them is half the story.
+    for (const feed of partFeeds) {
+      expect(feed.query.kinds).toEqual(['recall', 'complaint']);
+    }
+  });
+
+  test('every part feed filters on at least one component tag', () => {
+    for (const feed of partFeeds) {
+      expect(Array.isArray(feed.query.tags)).toBe(true);
+      expect(feed.query.tags.length).toBeGreaterThan(0);
+    }
+  });
+
+  test('slugs and names are unique', () => {
+    const slugs = partFeeds.map((f) => f.slug);
+    const names = partFeeds.map((f) => f.name);
+    expect(new Set(slugs).size).toBe(slugs.length);
+    expect(new Set(names).size).toBe(names.length);
+  });
+
+  test('every part feed explains itself', () => {
+    for (const feed of partFeeds) {
+      expect(typeof feed.description).toBe('string');
+      expect(feed.description.length).toBeGreaterThan(20);
+    }
+  });
+});
+
+describe('the tags that look misspelt and are not', () => {
+  /*
+   * `slugify` drops "/" rather than turning it into a hyphen, so an NHTSA
+   * component containing one collapses into a single run-on word. Both of
+   * these were checked against the live API: the run-on form returns items and
+   * the hyphenated form returns nothing. These tests exist so nobody
+   * "corrects" the spelling and silently empties two feeds.
+   */
+  test('slugify drops a slash instead of hyphenating it', () => {
+    expect(slugify('LATCHES/LOCKS/LINKAGES')).toBe('latcheslockslinkages');
+    expect(slugify('VISIBILITY/WIPER')).toBe('visibilitywiper');
+  });
+
+  test('it does hyphenate spaces and commas, which is why most tags look normal', () => {
+    expect(slugify('SERVICE BRAKES, AIR')).toBe('service-brakes-air');
+    expect(slugify('FUEL SYSTEM, GASOLINE')).toBe('fuel-system-gasoline');
+    expect(slugify('BACK OVER PREVENTION')).toBe('back-over-prevention');
+  });
+
+  test('the feeds use the run-on spellings that are actually in the data', () => {
+    const tags = partFeeds.flatMap((f) => f.query.tags);
+    expect(tags).toContain('latcheslockslinkages');
+    expect(tags).toContain('visibilitywiper');
+    expect(tags).not.toContain('latches-locks-linkages');
+    expect(tags).not.toContain('visibility-wiper');
+  });
+
+  test('every tag is what slugify would produce for some component', () => {
+    // Guards against a hand-written tag that no adapter could ever emit.
+    for (const tag of partFeeds.flatMap((f) => f.query.tags)) {
+      expect(slugify(tag)).toBe(tag);
+    }
+  });
+});