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MotorFiable

Z17DTH

1.7 CDTI 100-101 hp (Z17DTH, 2003-2007) engine: faults and reliability

Opel/Vauxhall 1.7 CDTI (Isuzu 4EE2 / «Circle L») version

With caution

It shares the EGR valve, injectors and timing belt with the rest of the 1.7 CDTI family, with the same documented risks that we describe in the faults for this engine.[1][2]

Years
2003–2007
Power
100–101 hp
Faults that affect it
4
2 of high or critical severity
Cars that use it
3
in our database

8 sourcesHow we work

What changes in this version

The first common rail version of this engine family, replacing the earlier simple direct injection; it was the entry-level version of the Meriva A from its launch in 2003 and also powered the Astra H from 2004.[3][4][5]

Engine codes of this version: Z17DTH.

Faults of the Z17DTH engine

The documented engine faults that affect this version and its years, from most to least important.

  1. 1High severityFrequency: OccasionalClutchDual-mass flywheel and clutch wearA documented case of an Opel Meriva with this engine had to have the dual-mass flywheel and clutch replaced at 66,000 km, for €1,600 at a French garage. It is neither an official nor a Spanish figure, but it points to real wear of these parts.
  2. 2Critical severityFrequency: RareTimingTiming belt: risk of serious failure if not changed on timeThe 1.7 CDTI has a timing belt (not a chain), with a replacement interval of 150,000 km or 6 years according to the buying guide consulted. We have not found documented cases of breakage on this engine, but going beyond that interval exposes you to a serious failure if the belt does give way.
  3. 3Medium severityFrequency: OccasionalEmissions controlSoot fouling of the injectors and EGR valveThis engine's EGR valve tends to clog with soot, according to a German buying guide focused on the Meriva A; there are also accounts of misadjusted or faulty injectors from 100,000 km on the Meriva and Astra with this engine.
  4. 4Medium severityFrequency: OccasionalElectronicsPremature alternator wearThe Hitachi-brand alternator fitted at the factory to the 1.7 CDTI tends to wear out sooner than expected, according to a German buying guide on the Opel Astra H, with typical replacements at around 140,000 km; there are similar accounts on the Opel Meriva with this engine.

Cars fitted with the Z17DTH engine

Open each car to see all its faults with this engine and what to check before buying it.

Honda

Opel

Frequently asked questions

Is the Z17DTH engine reliable?

Our verdict is “With caution”. It shares the EGR valve, injectors and timing belt with the rest of the 1.7 CDTI family, with the same documented risks that we describe in the faults for this engine.[1][2]

What faults does the Z17DTH engine have?

The documented ones that affect this version, by importance: dual-mass flywheel and clutch wear (high severity), timing belt: risk of serious failure if not changed on time (critical severity), soot fouling of the injectors and EGR valve (medium severity) and premature alternator wear (medium severity).

Which cars use the Z17DTH engine?

Opel Astra H (2004–2009), Opel Meriva A (2003–2010) and Honda Civic VII (2000–2005).[1][3][4][5][6][7][8]

Are you buying a car with the Z17DTH engine?

We will put you in touch with a partner only if you authorise it in the form.

Do you have a car with this engine? Tell us which faults you have had and at how many kilometres. Report your fault.

Sources

Every fact on this page links to its source. If you find an error, let us know.

  1. Opel Meriva A: ProblemeGebrauchtwagenberater.de · Other source · consulted 27 September 2026 · in German
  2. Opel Meriva B: ProblemeGebrauchtwagenberater.de · Other source · consulted 27 September 2026 · in German
  3. Circle L engineWikipedia (inglés) · Other source · consulted 27 September 2026
  4. Opel MerivaWikipedia (alemán) · Other source · consulted 27 September 2026 · in German
  5. Opel Astra HWikipedia (inglés) · Other source · consulted 27 September 2026
  6. Opel Astra H (A04): Probleme & KaufberatungGebrauchtwagenberater.de · Other source · consulted 27 September 2026 · in German
  7. Essai complet Opel Meriva : fiabilité et avisFiches-auto.fr · Owners' forum · consulted 27 September 2026 · in French
  8. Honda Civic (seventh generation)Wikipedia (inglés) · Other source · consulted 27 September 2026