MajorCommonEngine

Honda CR-V: B20B Balance Shaft Oil Pump Failure

B20B Balance Shaft Oil Pump Failure is a common engine fault on the Honda CR-V on the 1995–2001 cars, and we rate it major. Putting it right costs $900 to $1,800 at New Zealand independent workshop rates. Below is what goes wrong, the symptoms to notice on a test drive, where to look, and what to ask the seller before you hand over any money. It is one of 59 documented faults on the Honda CR-V.

Vehicle: Honda CR-V
Engine: B20B
Years: 1995–2001
Fuel: petrol
System: Engine

This page covers the Honda CR-V as a model. Some faults only affect particular engines or build years — enter a plate below to narrow the list to one car.

All Honda CR-V faults59 documented faults on this model

What you are looking at

No photograph available

We do not hold a verified photograph for this fault yet. We would rather show none than show a picture of something else.

What goes wrong

The B20B engine uses a balance shaft module mounted at the base of the engine block, incorporating a secondary oil pump that is gear-driven off the crankshaft. Over time, the pump gears wear — accelerated by infrequent oil changes or use of incorrect viscosity oil — causing a loss of oil pressure to the balance shaft bearings and, in advanced cases, starving the main oiling circuit. Once the balance shaft assembly loses lubrication, bearing journals score rapidly, producing knock and potential catastrophic engine damage.

What you would notice

Low-frequency rumble or knock from the lower engine block that worsens under load
Oil pressure warning light flickering at idle after the engine reaches operating temperature
Metallic debris visible when draining engine oil or on the drain plug magnet

How to check it

Where to look. Lower engine block, balance shaft module beneath the crankshaft centreline

Inspect oil for grey metallic particles indicating bearing scoring.
If a workshop inspection is possible: Pressure-test the balance shaft oil circuit with a mechanical gauge at idle; pressure below specification confirms pump wear.
Remove the balance shaft inspection cover and check for metallic debris in the oil.

What it costs to put right

$900 to $1,800 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

Ask the seller

“Has the balance shaft oil pump or module ever been replaced or inspected?”
“What oil change interval has been followed and what viscosity has been used?”
“Has the low oil pressure warning light ever illuminated?”

Now check the Honda CR-V you are actually looking at

Everything above is true of the model, and it is free. What it does not tell you is whether THIS car has been looked after: its odometer history and whether the reading has ever gone backwards, whether there is still money owing on it, whether it has been reported stolen, how many owners it has had and what it is really worth today. That comes from the official records for that plate. Enter the plate for the free details, or get the full history and a market valuation from $13.49.

Not sure what you would be paying for? See what a full KickTyres check includes.

Where this comes from

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.

Honda CR-V buyer questions

Is b20b balance shaft oil pump failure serious on a Honda CR-V?

We rate it major and common on the Honda CR-V. The B20B engine uses a balance shaft module mounted at the base of the engine block, incorporating a secondary oil pump that is gear-driven off the crankshaft. Over time, the pump gears wear — accelerated by infrequent oil changes or use of incorrect viscosity oil — causing a loss of oil pressure to the balance shaft bearings and, in advanced cases, starving the main oiling circuit. Once the balance shaft assembly loses lubrication, bearing journals score rapidly, producing knock and potential catastrophic engine damage.

How much does it cost to fix on a Honda CR-V?

$900 to $1,800 at New Zealand independent workshop rates. That figure is for this job on its own. A car showing the symptoms on this page is usually worth either walking away from or negotiating down by at least the repair figure.

Which Honda CR-V years are affected?

Our research records this fault on the 1995–2001 Honda CR-V. Build dates move around, especially on imported cars, so treat the range as the years to look hardest at rather than a guarantee either way. The official records tell you the exact build and first registration date for the car in front of you.

How do I check for it before I buy?

Inspect oil for grey metallic particles indicating bearing scoring. If a workshop inspection is possible: Pressure-test the balance shaft oil circuit with a mechanical gauge at idle; pressure below specification confirms pump wear. Remove the balance shaft inspection cover and check for metallic debris in the oil. Look here: Lower engine block, balance shaft module beneath the crankshaft centreline