Is the Mercedes‑Benz GLA200d / GLA220d engine reliable?

It depends on the generation. The OM651 (X156, 2013–2018) is rated ★★½☆☆ — it has timing chain stretch, injector failure, inlet manifold bolt shearing, and EGR cooler issues. The OM651 from 2012 onward (post‑balance shaft fix) is considered the value sweet spot. The OM654 (late X156, H247) is rated ★★★☆☆ — more modern but has valvetrain wear and AdBlue system faults.

What are the common problems with the Mercedes‑Benz GLA200d / GLA220d?

OM651 timing chain stretch (the most critical — can destroy the engine), piezo injector failure, inlet manifold bolt shearing, turbocharger bearing collapse, and EGR cooler leaks. OM654 valvetrain wear (camshafts and tappets), cold‑start misfire, rocker arm bearing failure, and AdBlue system faults.

Is it worth replacing a Mercedes‑Benz GLA200d / GLA220d engine, or should I scrap the car?

Depends on vehicle value and generation. Against a well‑kept H247 GLA220d worth £15,000–£25,000, a £3,000–£6,500 recon is a manageable 12–43% of the vehicle's value — worth it for a well‑maintained example. For an X156 GLA200d worth £5,000–£10,000, a £3,000 recon is more marginal.

How do I find my Mercedes‑Benz GLA200d / GLA220d engine code?

Listed on the VIN plate and vehicle documentation. The GLA200d and GLA220d use OM651 (X156 2013–2018) or OM654 (late X156 and H247). Tell us your registration date and we'll confirm it for free.

Can I repair the OM651's timing chain, or does it need a new engine?

Yes — if caught early. A timing chain and tensioner replacement (£1,500–£3,500) is far cheaper than a catastrophic chain snap (£1,500–£4,000 engine replacement). At the first sign of cold‑start rattle, book an inspection immediately. The chain sits on the transmission side of the engine, so it's an engine‑out job, but it's far cheaper than a new engine.

Mercedes-Benz GLA200d / GLA220d2013–present2 Engine Generations

Mercedes-Benz GLA200d / GLA220d Engine Replacement — Compare Prices & Get Quotes

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Mercedes GLA Diesel Engines — from £1,500 to £6,500Common codes: OM651, OM654

Mercedes GLA Diesel Engines — from £1,500 to £6,500· Common codes: OM651, OM654

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The GLA200d / GLA220d THROUGH TIME — Era Map

Four generations. Four eras. One guide to reliability, costs and what really matters.

Era Note

Early OM651 with piezo injectors and rear chain — timing chain stretch is the defining weakness.

GenerationYearsEngine CodeReliabilityRecon CostEra Note

X156 (GLA200 CDI) BMW 320d X156 (GLA200 CDI)

2013–2015OM651 (2.1 CDI — 136 bhp)★★½☆☆ [NEWLY ASSIGNED — see Data Note]£1,500–£3,500 [MB‑QUOTE]Early OM651 with piezo injectors and rear chain — timing chain stretch is the defining weakness.

X156 (GLA200d/GLA220d) BMW 320d X156 (GLA200d/GLA220d)

2015–2018OM651 (2.1 CDI — 136–177 bhp)★★½☆☆ [NEWLY ASSIGNED — see Data Note]£1,500–£4,000 [MB‑QUOTE]Later OM651 — timing chain, injector and inlet manifold issues remain common.

X156 (GLA200d/GLA220d) BMW 320d X156 (GLA200d/GLA220d)

2018–2020OM654 (2.0 CDI — 150–190 bhp)★★★☆☆ [NEWLY ASSIGNED — see Data Note]£2,500–£5,000 [MB‑QUOTE]Late X156 with the OM654 — modern 2.0 diesel; valvetrain wear and rocker arm bearing failure are the main watchpoints.

H247 (GLA200d/GLA220d) BMW 320d H247 (GLA200d/GLA220d)

2020–presentOM654 (2.0 CDI — 150–190 bhp)★★★☆☆ [NEWLY ASSIGNED — see Data Note]£3,000–£6,500 [MB‑QUOTE]The current GLA — OM654 with AdBlue; AdBlue system faults and cold‑start misfire are the main watchpoints.

Why use this era map?

Every cost guide, reliability rating and engine code on this page is aligned to the data above. This keeps everything consistent and trustworthy.

Real UK Cost Data

Verified Reliability

Expert Insights

Updated for 2025

Mercedes-Benz GLA200d / GLA220d Engine Replacement Costs

Supply Only£2,500–£5,000

Fitted (Indie)£3,400–£6,200

Warranty12–24 months

Best ForMost owners — best cost/warranty balance

Engine TypeSupply OnlyFitted (Indie)WarrantyBest For

Used Engine£1,500–£3,500£2,200–£4,7001–6 monthsBudget priority; vehicle under £5,000

Reconditioned Engine£2,500–£5,000£3,400–£6,20012–24 monthsMost owners — best cost/warranty balance

Rebuilt Engine£3,500–£6,500£4,400–£7,70012–24 monthsLong‑term ownership; 3+ year horizon

Main Dealer New£8,000–£12,000£9,500–£14,00024–36 monthsInsurance jobs, warranty claims

Labour estimate: Fitting a GLA diesel engine typically takes 10–14 hours at £65–£95/hr (independent) or £110–£160/hr (London/SE dealer). Timing chain replacement on the OM651 is an engine‑out job, significantly increasing labour costs.

Common Problems

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Mercedes-Benz GLA200d / GLA220d — Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

Mercedes-Benz GLA200d / GLA220d — Repair, Buy, or Replace?

Every 320d has a story. Make the right call with clear data, real-world costs, and honest guidance from UK specialists.

Can It Be Repaired?

ProblemRepairable?Typical CostWhen It Makes SenseOM651 timing chain stretch✅ Yes£1,500–£3,500If caught early; engine‑out job but cheaper than replacementPiezo injector failure (OM651)✅ Yes£400–£1,200Replace failed injectors with Delphi or BoschOM651 inlet manifold bolt shearing✅ Yes£500–£1,200Replace manifold or fit repair kitOM651 turbocharger bearing collapse✅ Yes£1,500–£3,500Catch it before oil system contaminationOM654 valvetrain wear✅ Yes£1,500–£3,500Cylinder head work required; catch it before camshaft failureOM654 AdBlue system failure✅ Yes£500–£1,500Replace NOx sensors, pump or injector; don't let countdown expireOM651 EGR cooler leak✅ Yes£400–£1,000Replace EGR cooler; check for coolant contamination

Buying This GLA Diesel? Check These First

Buy If

Full Mercedes service history with documented oil changes (more frequent than manufacturer recommendation)
Post‑2018 OM654 — generally more refined than the OM651
Evidence of timing chain work on OM651 cars
No AdBlue system issues (H247) or evidence of NOx sensor replacement
Post‑2012 OM651 (balance shaft issues resolved)

Avoid If

Cold‑start rattle with no timing chain history (OM651) — the single most important check
Diesel smell from the engine bay — potential injector leak
Cold‑start misfire or ticking (OM654) — potential valvetrain wear
AdBlue countdown active (H247) — potential system failure
Poor service history on any generation

Closing Verdict

The GLA200d / GLA220d is a stylish compact SUV that offers excellent fuel economy and refinement. But the engine choice determines your ownership experience. The OM651 (X156, 2013–2018) has well‑documented timing chain, injector, and inlet manifold issues — it's a robust engine when maintained, but neglected examples can become money pits. The OM654 (late X156, H247) is more modern but has valvetrain wear and AdBlue system faults. The OM651 from 2012 onward (post‑balance shaft fix) is considered the value sweet spot. Buy on documented history, and if you're looking at an OM651, demand chain‑history proof before you commit.

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Buying Checklist

Before you buy a used Mercedes‑Benz GLA200d / GLA220d (or before you commit to an engine replacement), check these:

Cold Start — Listen for rattling noise on startup (OM651 timing chain warning) or misfire/judder (OM654 valvetrain wear)

Service History — Including which engine era (OM651 for X156 2013–2018, OM654 for late X156 and H247) — see the Era Map above

Diesel Smell — Any strong diesel smell from the engine bay? Injector leak‑off pipe or injector failure

AdBlue System — Any AdBlue warnings? Countdown active? NOx sensor or pump failure (H247)

Inlet Manifold — Any vacuum‑type noise under acceleration? Inlet manifold bolt shearing (OM651)

Turbo Health — Any whining or loss of power? Turbo bearing collapse (OM651)

Engine Warning Light — Have codes been read? Any unresolved timing, injector, or emissions issues?

MOT History — Check for emissions‑related failures; often point to EGR, DPF, or AdBlue problems

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.

Buy smart. Drive with confidence.

A few checks today can save thousands tomorrow. Use this checklist to avoid the most common 320d pitfalls.

Engine Codes

OM651 (651.9xx)

Years2013–2018

Power136–177 bhp / 300–350 Nm

2025 Enquiries— (pattern data)

Avg. Recon Cost£1,500–£4,000 [MB‑QUOTE]

Engine CodeYearsPower2025 EnquiriesAvg. Recon Cost

OM651 (651.9xx)2013–2018136–177 bhp / 300–350 Nm— (pattern data)£1,500–£4,000 [MB‑QUOTE]

OM654 (654.9xx)2018–present150–190 bhp / 320–400 Nm— (pattern data)£2,500–£6,500 [MB‑QUOTE]

Technical Specs

OM654 — representative

Displacement2,143cc

Cylinders4‑cylinder inline

Compression Ratio16.2:1

Fuel SystemCommon‑rail direct injection

TurbochargerSingle variable geometry turbo (VGT) or bi‑turbo

Timing DriveSimplex chain (transmission side)

Displacement1,950cc

Cylinders4‑cylinder inline

Compression Ratio15.5:1

Fuel SystemCommon‑rail direct injection

TurbochargerSingle variable geometry turbo (VGT)

Timing DriveChain (transmission side)

Market Intelligence

Most Common Failure

OM651 timing chain stretch and injector failure — approximately 55% of OM651 enquiries; OM654 valvetrain wear and AdBlue issues

[PATTERN DATA]

Average Enquiry Mileage

58,000

miles

[PATTERN DATA]

Average Replacement Cost

£3,000

reconditioned, supply only

[MB‑QUOTE]

Most Requested Engine Code

OM651

[MB‑VERIFIED]

Peak Enquiry Season

Winter — cold starts expose timing chain and valvetrain issues

[PATTERN DATA]

Regional Demand

London22%

South East20%

Midlands15%

PATTERN DATA

Regional Demand Breakdown

22%London

20%South East

Frequently Asked Questions

All prices are indicative UK market ranges based on historical quote data from our network of engine specialists. Actual costs vary by variant, engine code, damage severity and workshop location. Use our free comparison tool to get tailored quotes. Every engine supplied through EnginesMarket carries a minimum 12‑month unlimited‑mileage warranty — always confirm terms with your chosen supplier.

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100% Free

No hidden fees

No Obligation

Get quotes with zero pressure

UK Specialists

20+ vetted experts

12-Month Warranty

As standard

Nationwide Delivery

Supply & fit available