How to carry out replacement: Spark Plug 1.4 Siena
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Change Siena 1.0 Spark Plug yourself – manuals and video tutorials

How to change spark plugs on FIAT Siena (178_, 172_) – replacement guide

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When to replace the Spark Plug on your FIAT SIENA
Recommended replacement interval for the part category Spark plug : 18 month / 30000 km
Important!
This replacement procedure can be used for:
FIAT Siena (178_, 172_) 1.6 16V (178CXD1AAT), FIAT Siena (178_, 172_) 1.3 (178CXG1AAM, 178CXG1AAP, 178CXG1AAT), FIAT Siena (178_, 172_) 1.6 16V, FIAT Siena (178_, 172_) 1.4, FIAT Siena (178_, 172_) 1.4 Cat, FIAT Siena (178_, 172_) 1.3 (178CXS1AAI, 178BYA1AAT, 178CYA1AAT), FIAT Siena (178_, 172_) 1.4 8V (17201A1, 17245A1), FIAT Siena (178_, 172_) 1.5, FIAT Siena (178_, 172_) 1.6 (178CYC1AAT), FIAT Siena (178_, 172_) 1.0, FIAT Siena (178_, 172_) 1.4 8V (17140A1) … View more

The steps may slightly vary depending on the car design.

This video shows the replacement procedure of a similar car part on another vehicle

All the parts you need to replace – Spark Plug for Siena (178_, 172_) and other FIAT models
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Tools
Replacement: spark plugs – FIAT SIENA (178_). List of the tools you'll need:
High-temperature anti-seize lubricant
Drive socket # 10
Drive socket # 16
Spark plug socket # 16
Ratchet wrench
Torque wrench
Crow bar
Flat Screwdriver
Microfibre towel
Fender cover
Buy tools
Replacement: spark plugs – FIAT SIENA (178_). Tip from AUTODOC:
  • The replacement procedure is the same for all spark plugs.
  • All work should be done with the engine stopped.
Replacement: spark plugs – FIAT SIENA (178_). Take the following steps:
  1. Step 1
    Open the hood.
    Step 2
    Use a fender protection cover to prevent damaging paintwork and plastic parts of the car.
    Step 3
    How to change Spark Plug on Siena 1996 - free PDF and video manuals
    Unscrew the filter housing fastening bolts. Use a drive socket #10. Use a ratchet wrench.
  2. Step 4
    How to replace FIAT Siena (178_, 172_) 1.4 1997 Spark Plug - step-by-step manuals and video guides
    Remove the air filter housing retaining spring.
  3. Step 5
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    Remove the air filter housing.
  4. Step 6
    Changing Spark Plug on FIAT Siena (178_, 172_) 1.6 16V (178CXD1AAT) 1999 by yourself
    Cover the throttle body with a microfibre towel to prevent dust and dirt from getting into the system.
  5. Step 7
    How to remove FIAT SIENA 1.4 Cat 2000 Spark Plug - online easy-to-follow instructions
    Detach the crankcase ventilation hose from the engine cover at the left. Use a crowbar.
  6. Step 8
    How to replace Spark Plug on FIAT Siena (178_, 172_) 2001: download PDF manuals and video instructions
    Detach the throttle valve connectors. Use a crowbar.
  7. Step 9
    How hard is it to do yourself: Spark Plug replacement on Siena 1.3 (178CXS1AAI, 178BYA1AAT, 178CYA1AAT) 2002 - download illustrated guide
    Remove the spark plug wire connectors from the spark plug wells.
    Replacement: spark plugs – FIAT SIENA (178_). AUTODOC recommends:
    Be careful to avoid damaging spark plug wires.Remember the sequence of the spark plug wires connectors.
  8. Step 10
    Need to know how to renew Spark Plug on FIAT SIENA 2003? This free workshop manual will help you to do it yourself
    Clean dirt, dust and debris from inside the spark plug wells.
  9. Step 11
    Changing of Spark Plug on Siena 2004 won't be an issue if you follow this illustrated step-by-step guide
    Unscrew the spark plugs. Use the spark plug socket #16. Use a ratchet wrench.
  10. Step 12
    FIAT SIENA 1.0 Spark Plug replacement: online guides and video tutorials
    Take out the spark plugs. Use the spark plug socket #16.
  11. Step 13
    Replacing Spark Plug on Siena 2006 1.4 by yourself
    Apply a thin layer of a special high temperature anti-seize lubricant to the threads of the new spark plugs.
  12. Step 14
    Siena (178_, 172_) 1.4 Cat 2007 Spark Plug DIY replacement workshop manual
    Install the new spark plugs into their mounting seats. Use the spark plug socket #16.
  13. Step 15
    How to change Spark Plug on FIAT Siena (178_, 172_) 2008 - tips and tricks
    Screw new spark plugs and tighten them. Use the spark plug socket #16. Use a torque wrench. Tighten it to 27 nm torque.
    Replacement: spark plugs – FIAT SIENA (178_). Professionals recommend:
    Don't tighten the plugs with excessive force. Exceeding tightening torque can damage the thread connection. Be careful when working with a spark plug wrench. Its skewing can cause damage to the threaded connection.
  14. Step 16
    Step-by-step recommendations for DIY replacement Siena 2009 1.4 Cat Spark Plug
    Treat the spark plug wire connectors. Use high-temperature grease. Use a flat screwdriver.
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