{"id":5791,"date":"2026-05-10T08:00:00","date_gmt":"2026-05-10T08:00:00","guid":{"rendered":"https:\/\/www.zamulecars.com\/uncategorized\/mercedes-cdi-bomba-cp4-fallos-tipicos-mallorca\/"},"modified":"2026-07-15T12:54:50","modified_gmt":"2026-07-15T12:54:50","slug":"mercedes-cdi-bomba-cp4-fallos-tipicos-mallorca","status":"publish","type":"post","link":"https:\/\/www.zamulecars.com\/en\/uncategorized\/mercedes-cdi-bomba-cp4-fallos-tipicos-mallorca\/","title":{"rendered":"Mercedes CDI: CP4 High-Pressure Pump - Symptoms and Professional Solution"},"content":{"rendered":"<style>\nbody{background:#0a0a09 !important;margin:0 !important}\nbody .et_pb_section,body .et_pb_row,body .et_pb_row .et_pb_column,body .et_pb_section_regular,body article.post,body article.page,body .et_pb_post_content,body .entry-content,body main,body #main-content,body #left-area,body .container,body .et_post_meta_wrapper,body .et-l--body{padding:0 !important;margin:0 !important;max-width:100% !important;width:100% 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0}\n.zb-price-tag{display:inline-block;background:#f7941d;color:#1d1d1b;font-size:10px;font-weight:900;\n  letter-spacing:.5px;padding:5px 10px;border-radius:6px;text-transform:uppercase;margin-bottom:10px}\n.zb-price h3{margin:0 0 6px;font-size:18px;font-weight:900;color:#fff;line-height:1.2}\n.zb-price-num{font-size:28px;font-weight:900;color:#f7941d;line-height:1;margin-bottom:8px}\n.zb-price-num small{font-size:13px;font-weight:700;color:#cfcfca;display:block;margin-top:3px}\n\n\/* RELATED *\/\n.zb-rel{background:#14140f;color:#fff;padding:40px 24px}\n.zb-rel-wrap{max-width:980px;margin:0 auto}\n.zb-rel h2{font-size:22px;font-weight:900;color:#fff;margin:0 0 20px;text-align:center}\n.zb-rel h2 em{color:#f7941d;font-style:normal}\n.zb-rel-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}\n@media(max-width:560px){.zb-rel-grid{grid-template-columns:1fr}}\n.zb-rel-card{background:#2a2a26;border:1px solid #3a3a36;border-radius:12px;padding:16px;\n  display:flex;flex-direction:column;gap:4px;text-decoration:none;color:#fff;transition:.15s}\n.zb-rel-card:hover{border-color:#f7941d;background:rgba(247,148,29,.06)}\n.zb-rel-card strong{color:#f7941d;font-size:13px;font-weight:800;letter-spacing:.3px;text-transform:uppercase}\n.zb-rel-card span{font-size:14px;color:#cfcfca;line-height:1.4}\n\n\/* FOOTER MINI *\/\n.zb-foot{background:#0a0a09;color:#8a8a87;padding:30px 24px;text-align:center;border-top:1px solid rgba(255,255,255,.08)}\n.zb-foot p{margin:0;font-size:13px}\n.zb-foot a{color:#f7941d;font-weight:700}\n<\/style>\n\n\n<div class=\"zb\">\n\n  <nav class=\"zb-crumb\">\n    <a href=\"\/en\/\">Home<\/a> \u00b7 <a href=\"\/en\/blog\/\">Blog<\/a> \u00b7 <strong>Mercedes CDI CP4 Pump<\/strong>\n  <\/nav>\n\n  <article class=\"zb-hero\">\n    <div class=\"zb-hero-wrap\">\n      <span class=\"zb-cat\">HIGH-END MERCEDES INJECTION<\/span>\n      <h1 class=\"zb-h1\">Mercedes CDI: when the <em>CP4 pump<\/em> starts to fail<\/h1>\n      <div class=\"zb-meta\">\n        <span>?? 10 May 2026<\/span>\n        <span>\ud83d\udcdd <strong>Zamule technical team<\/strong><\/span>\n        <span>? 5 min read<\/span>\n        <span>?? Palma de Mallorca<\/span>\n      <\/div>\n    <\/div>\n  <\/article>\n\n  <section class=\"zb-art\">\n    <div class=\"zb-art-wrap\">\n\n      <p>The Mercedes <strong>C, E, S Class CDI and SUV GLC GLE GLS with OM651 (2.1 \/ 2.2 CDI) and OM642 (3.0 V6 CDI) engines<\/strong> They install a Bosch CP4 high-pressure pump. It's a brilliantly efficient component, but with a known weakness when fed with mediocre quality diesel.<\/p><p>We explain the typical faults and how we resolve them at Zamule Cars Palma de Mallorca using official Mercedes Xentry.<\/p>\n\n      <h2>Why does the CP4 pump fail in Mercedes CDI?<\/h2>\n      <p>The Bosch CP4 pump is a very high-precision radial pump that generates <strong>pressures of up to 2,500 bar<\/strong> on the rail. Its weakness: critical lubrication that depends on diesel fuel.<\/p><p>When the diesel has <em>low lubrication<\/em> (low-flow diesel, condensed water in the tank, cheap biodiesel), the internal rollers and cams suffer premature wear. Result:<\/p><ul><li>Metallic shavings in the system (grey metallic contamination in the filter)<\/li><li>Incorrect fuel rail pressure<\/li><li>Damage to injectors in series<\/li><li>In extreme cases: engine rendered unusable<\/li><\/ul>\n\n      <h2>Symptoms of a failing CP4 pump<\/h2>\n      <ul><li>Hard starting, especially when hot after stopping<\/li><li>Jerking under partial load<\/li><li>Gradual loss of power<\/li><li>Recurring emergency mode<\/li><li>Codes P0087 (low rail pressure) or P0089<\/li><li>Engine warning: pump efficiency or catalytic converter issue<\/li><li>Abnormal consumption<\/li><li>Extra or 'tic-tic' type noise near the pump<\/li><li>Grey metallic shavings in fuel filter (CRITICAL warning)<\/li><\/ul><p><strong>If you find metal shavings in the filter, do not start the car again and bring it in for an immediate diagnosis.<\/strong><\/p>\n\n      <div class=\"zb-codes\">\n        <h3>?? Related OBD-II codes<\/h3>\n        <ul>\n          <li><strong>P0087<\/strong> Low fuel rail pressure<\/li><li><strong>P0088<\/strong> High fuel rail pressure<\/li><li><strong>P0089<\/strong> High-pressure pump performance<\/li><li><strong>P1247 \/ P1248<\/strong> Fuel regulation out of range<\/li><li><strong>P0091 \/ P0093<\/strong> Pump pressure regulator<\/li>\n        <\/ul>\n      <\/div>\n\n      <h2>Zamule Solution: Xentry diagnosis + OEM pump replacement<\/h2>\n      <p>When a Mercedes CDI arrives with suspected CP4 issues, our protocol:<\/p><ol><li><strong>Mercedes Xentry Diagnostic<\/strong> + rail pressure test on start-up and acceleration<\/li><li>Fuel filter inspection, checking for metal shavings (key)<\/li><li>If there are shavings: <strong>complete system cleaning<\/strong> (rail, lines, filters, tank) + pump replacement + replacement of affected injectors<\/li><li>If there are no metal shavings and the pump is at fault: CP4 OEM Bosch pump replacement with ?10% over dealership price<\/li><li>New OEM fuel filter<\/li><li>High-pressure line cleaning<\/li><li>Xentry pressure regulator adaptation<\/li><li>Final rail pressure test + check<\/li><li>6-month written warranty<\/li><\/ol><blockquote>If the CP4 has sent metal shavings into the system, replace <strong>only the pump<\/strong> That's a mistake. Chips damage the injectors. We're telling you this honestly after diagnosis.<\/blockquote>\n\n      <div class=\"zb-price\">\n        <span class=\"zb-price-tag\">? Estimated price Zamule<\/span>\n        <h3>CP4 pump replacement Mercedes CDI<\/h3>\n        <div class=\"zb-price-num\">from 980 ?<small>+ VAT high-end OEM Bosch pump + labour + filter<\/small><\/div>\n        <p style=\"margin:8px 0 0;font-size:14px;color:#cfcfca\">CP4 OEM Bosch pump with ?10%, OEM fuel filter, line cleaning, regulator adaptation, labour, and a 6-month written warranty. Dealership: 1,800-2,400 ?. If there are metal shavings and a full system + injector cleaning is required: please enquire.<\/p>\n      <\/div>\n\n      <h2>How to avoid CP4 pump failure<\/h2>\n      <ul><li><strong>Always fill up at well-known brand fuel stations with high turnover.<\/strong> (Repsol, Cepsa, BP, Galp, Shell)<\/li><li>Avoid small or low-cost petrol stations (higher risk of water or impurities)<\/li><li>Change your fuel filter every 30,000-40,000 km \u2013 don't wait until 60,000.<\/li><li>Mercedes oil specs MB 229.51 \/ 229.71 every 15,000-20,000 km<\/li><li>Don't run out of fuel (tank almost empty or condensation builds up)<\/li><li>If you're returning from a long winter without use, change the fuel filter before pushing the engine.<\/li><li>Preventive Xentry Diagnostic every 60,000-80,000 km<\/li><li>Inspect the fuel filter upon replacement: look for grey shavings or metallic sheen<\/li><\/ul>\n\n      <div class=\"zb-cta\">\n        <h3>Does your car have <em>these symptoms?<\/em><\/h3>\n        <p>Diagnosis from 49 ? + VAT deductible if you repair with us. 6-month written warranty.<\/p>\n        <div class=\"zb-cta-btns\">\n          <a href=\"https:\/\/wa.me\/34682931164?text=Hola%20Zamule%2C%20mi%20Mercedes%20CDI%20tiene%20problemas%20con%20la%20bomba%20alta%20presi\u00f3n\" target=\"_blank\" rel=\"noopener\" class=\"zb-cta-btn\">?? WhatsApp 682 931 164<\/a>\n          <a href=\"tel:+34682931164\" class=\"zb-cta-btn zb-cta-btn--out\">?? Call<\/a>\n        <\/div>\n      <\/div>\n\n      <h2>Conclusion <em>act today, save tomorrow<\/em><\/h2>\n      <p>The CP4 pump of the Mercedes CDI is an expensive component, but <strong>perfectly repairable<\/strong> if you act in time. Pump replacement alone: 980-1.500 ?. Waiting until it sends out metal shavings and damages the injectors: 2.500-5.000 ?. <strong>Transparency guaranteed<\/strong>.<\/p><p><a href=\"\/en\/especialistas-mercedes-palma\/\">More about our Mercedes service<\/a> \u00b7 <a href=\"\/en\/reparacion-inyectores-inyeccion-palma-mallorca\/\">Common Rail injector repair<\/a>.<\/p>\n\n    <\/div>\n  <\/section>\n\n  <section class=\"zb-rel\">\n    <div class=\"zb-rel-wrap\">\n      <h2>Related services <em>at Zamule Cars<\/em><\/h2>\n      <div class=\"zb-rel-grid\">\n        <a class=\"zb-rel-card\" href=\"\/en\/especialistas-mercedes-palma\/\"><strong>? Mercedes Specialists<\/strong><span>Mercedes Xentry official diagnosis A-S Class + GL + AMG<\/span><\/a><a class=\"zb-rel-card\" href=\"\/en\/reparacion-inyectores-inyeccion-palma-mallorca\/\"><strong>?? Injector repair<\/strong><span>Test bench + ultrasound + OEM Bosch ?10%<\/span><\/a><a class=\"zb-rel-card\" href=\"\/en\/diagnostico-avanzado-palma-mallorca\/\"><strong>?? Advanced Diagnosis<\/strong><span>Mercedes Xentry official test CP4 rail pressure<\/span><\/a><a class=\"zb-rel-card\" href=\"\/en\/mantenimiento-revisiones\/\"><strong>?? Maintenance + 25 points<\/strong><span>Fuel filter and oil Mercedes specs<\/span><\/a>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <div class=\"zb-foot\">\n    <p>Zamule Cars C\/ Gremi Fusters 11 07009 Palma de Mallorca <a href=\"tel:+34682931164\">+34 682 931 164<\/a> \u00b7 <a href=\"mailto:talleres@zamule.com\">talleres@zamule.com<\/a><\/p>\n  <\/div>\n\n<\/div>\n\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\":\"https:\/\/schema.org\",\n  \"@type\":\"BlogPosting\",\n  \"headline\":\"Mercedes Clase C E S CDI bomba alta presi\u00f3n Bosch CP4 fallos t\u00edpicos y soluci\u00f3n profesional Zamule Cars\",\n  \"image\":\"https:\/\/www.zamulecars.com\/wp-content\/uploads\/2026\/06\/10-mercedes-cp4-scaled.jpg\",\n  \"datePublished\":\"2026-05-10T10:00:00+02:00\",\n  \"dateModified\":\"2026-05-10T10:00:00+02:00\",\n  \"author\":{\"@type\":\"Organization\",\"name\":\"Zamule Cars\",\"url\":\"https:\/\/www.zamulecars.com\/\"},\n  \"publisher\":{\"@type\":\"Organization\",\"name\":\"Zamule Cars\",\"logo\":{\"@type\":\"ImageObject\",\"url\":\"https:\/\/www.zamulecars.com\/wp-content\/uploads\/zamule-logo.png\"}},\n  \"mainEntityOfPage\":{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.zamulecars.com\/blog\/mercedes-cdi-bomba-cp4-fallos-tipicos-mallorca\/\"},\n  \"articleSection\":\"ALTA GAMA \u00b7 MERCEDES \u00b7 INYECCI\u00d3N\",\n  \"keywords\":\"Mercedes CDI bomba CP4 fallos, OM651 OM642 bomba alta presi\u00f3n, taller Mercedes Palma\",\n  \"inLanguage\":\"es-ES\"\n}\n<\/script>","protected":false},"excerpt":{"rendered":"<p>Inicio \u00b7 Blog \u00b7 Mercedes CDI \u00b7 Bomba CP4 ALTA GAMA \u00b7 MERCEDES \u00b7 INYECCI\u00d3N Mercedes CDI: cuando la bomba CP4 empieza a fallar \ud83d\udcc5 10 May 2026 \ud83d\udcdd Equipo t\u00e9cnico Zamule \u23f1 5 min lectura \ud83d\udccd Palma de Mallorca Los Mercedes Clase C, E, S CDI y SUV GLC GLE GLS con motor OM651 [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":5790,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"Mercedes CDI bomba CP4 fallos","_yoast_wpseo_title":"Mercedes CDI en Palma | Zamule Cars","_yoast_wpseo_metadesc":"Los Mercedes Clase C, E, S CDI y SUV GLC GLE GLS con motor OM651 (2.1 \/ 2.2 CDI) y OM642 (3.0 V6 CDI) montan bomba de alta presi\u00f3n Bosch CP4. 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