How much does o2 sensor replace (downstream / after cat) cost in New Zealand?

Typically NZ$180–NZ$480 including GST at a NZ$120 an hour workshop rate (A$180–A$460 in Australia at A$140 an hour).

O2 sensor replace (downstream / after cat): how much does it cost?

Typically NZ$180–NZ$480 in New Zealand and A$180–A$460 in Australia, including GST. Most cars.

	Parts (trade)	Labour	Sublet	Total incl GST
New Zealand	NZ$80–NZ$240	0.5–1 h	—	NZ$180–NZ$480
Australia	A$75–A$220	0.5–1 h	—	A$180–A$460

Totals use a standard workshop rate of NZ$120 or A$140 an hour and a 25% parts markup, plus GST. Your workshop's rate and parts prices will differ.

What affects the price

Narrowband sensor after the catalytic converter. Universal splice-in sensors are cheaper than direct-fit. Check the cat itself if P0420 is also logged.

Other electrical repairs

12 V battery replace, standard flooded (small / medium car)NZ$190–NZ$330
12 V battery replace, standard flooded (SUV / ute / 4WD)NZ$290–NZ$500
12 V battery replace, EFB / AGM start-stop (Japanese / Korean)NZ$340–NZ$710
12 V AGM battery replace with battery registration / coding (European)NZ$440–NZ$830
Alternator replace (small / medium car, petrol)NZ$510–NZ$1,020
Alternator replace (SUV / ute / diesel)NZ$750–NZ$1,560
Alternator replace (European, smart charging)NZ$930–NZ$2,130
Starter motor replace (small / medium car)NZ$500–NZ$970
Starter motor replace (SUV / ute / European)NZ$780–NZ$1,850
A/C evacuate, vacuum test and regas (R134a, older cars)NZ$150–NZ$290

Researched by Credov in October 2026 from NZ and Australian parts suppliers and workshop price guides. Typical ranges, not quotes: ask a workshop for a quote before you rely on a price. All repair costs.