Thinking about buying a used Honda StepWGN (2001–2022) in New Zealand? We've documented 27 known faults for this model spanning cooling, suspension, engine, and transmission. Each researched and verified before it's published. The most serious issues here are rated critical. Two are set out in full below — the rest, with the symptoms, repair costs and checks for each, are free with an account.
27
Documented faults
Critical
Most serious
$350–$950
Typical repair
8
Systems covered
Known Honda StepWGN faults
Every fault below is documented specifically for this model — researched and verified before it’s published.
01i-MMD inverter electric water pump bearing failure
CriticalOccasionalCooling $1,200–$3,800 to fix
The RP6 Spada e:HEV uses Honda's second-generation i-MMD hybrid system, which relies on a dedicated electric water pump (EWP) to circulate coolant through the Power Control Unit (PCU) inverter and drive motor assembly. Premature bearing wear inside this EWP reduces coolant flow to the inverter, triggering PCU over-temperature protection faults and forcing the vehicle into reduced-power or combustion-only limp mode. Early bearing degradation is audible as a high-pitched whine from the front-left engine bay at low road speeds. Replacement requires draining the separate inverter cooling circuit and fitting a JDM-specification Honda EWP assembly, which can be on extended back-order for grey-import vehicles without dealer parts priority.
Symptoms to notice
High-pitched whine or grinding from front-left engine bay at low speed
Hybrid system warning lamp illuminated on cluster
PCU over-temperature DTC stored (P0A7F or related hybrid thermal codes)
Inverter coolant reservoir level below minimum mark
What to check
Start the engine cold and listen for a high-pitched bearing whine from the front-left bay where the EWP is mounted on the inverter cooling circuit. Check the separate inverter coolant reservoir level and note any discolouration. Scan for hybrid PCU temperature or coolant flow fault codes before purchase. Request any prior hybrid system service records or warranty claims.
Where to look: Front engine bay left side — electric water pump mounted on the PCU inverter cooling circuit adjacent to the hybrid drive unit
Ask the seller
“Has the hybrid system ever shown a warning lamp or entered limp-home mode?”
“Has the inverter coolant circuit ever been topped up or flushed?”
“Are there any stored hybrid system fault codes on the scan tool?”
“Has the electric water pump ever been inspected or replaced?”
02Rear Trailing Arm Bush Collapse
MinorCommonSuspension $300–$800 to fix
Rear trailing arm bushes harden and collapse causing rear knocking and imprecision.
Symptoms to notice
Knocking from rear suspension over rough surfaces
Imprecise rear handling feel at speed
What to check
Inspect rear trailing arm bushes for cracking. Push arm — any movement indicates collapsed bushes.
Where to look: Rear suspension trailing arm mounting points
Ask the seller
“Has the rear trailing arm bush collapse been inspected or repaired?”
SuspensionCritical
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Body & RustMajor
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Fluid LeaksMinor
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25 more documented faults on the Honda StepWGN
Symptoms, what to check, where to look and what to ask the seller — for every fault above. Free with an account, no card needed. One account covers one vehicle, so make it the car you’re actually looking at.
This page covers the model. Enter the plate of the actual car you’re looking at and see its year, engine, safety rating and register flags — free, no account needed.
Like any used car, it depends on the specific example and its service history. Across the 27 documented faults for the Honda StepWGN, the recurring problem areas are cooling, suspension, and engine. A Honda StepWGN with a full service history and no signs of the issues listed on this page can be a sound buy but each one needs to be checked individually before you commit.
What are the most common problems with a used Honda StepWGN?
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We've catalogued 27 known faults for the Honda StepWGN, covering cooling, suspension, and engine. Two are written out in full on this page. The rest — with the symptoms to notice, what to inspect, and typical repair costs for each — are free once you create an account.
How much do repairs cost on a Honda StepWGN?
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Most single repairs on the Honda StepWGN fall between $350–$950 at NZ independent-workshop rates. Some of the 27 documented faults cost less and a few cost considerably more, and no one car needs them all. Knowing which ones to look for before you view is what lets you negotiate the price down or walk away.
Should I get a pre-purchase inspection on a Honda StepWGN?
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Yes. A Honda StepWGN inspection focused on its known weak points is the single best way to avoid an expensive mistake. KickTyres gives you a guided, model-specific inspection plus a market valuation and negotiation figure for $17.90 far less than the cost of missing one of the faults on this page.