DENSO 234-5012 air / fuel ratio sensor for the 2007-2012 Mazda CX-7 4-cylinder 2.3L reads the air-fuel ratio in the exhaust and reports it to the engine computer. It is built and tested to the strictest OE standards.
- Laser-welded stainless housing that resists corrosion
- PTFE filter that blocks contaminants under harsh engine conditions
- Dual-layer protection around the ceramic element for fast, reliable response times
- Heated wide-band sensor with 5 wires
Quick facts
- Part: DENSO 234-5012 air / fuel ratio sensor
- Fits: 2007-2012 Mazda CX-7 4-cylinder 2.3L
- Position: Upstream
- Condition: New
A failing air / fuel ratio sensor can show up as a check engine light, rougher running or poorer fuel economy, though other faults can look the same. If the sensor is the cause, this one replaces it. Before buying, with the engine off and cool, look over the sensor harness and connector for cracked, melted or chafed insulation, since a damaged harness can mimic a bad sensor.
Fits
This is a direct-fit replacement for the 2007-2012 Mazda CX-7 4-cylinder 2.3L (L4-2.3L), made for the upstream position.
Specifications
Fit and size
- Position: Upstream
- Quantity per vehicle: 1
- Thread diameter: 0.711 in
- Wiring harness length: 31.50 in
- Wire quantity: 5
Build and materials
- Sensor type: Wide-band, heated
- Connector gender: Male
- Grade: Standard replacement
- Condition: New
- Country of origin: Japan
In the box
This listing is one air / fuel ratio sensor; the 2007-2012 Mazda CX-7 4-cylinder 2.3L takes one at this upstream position.
This part cross-references / interchanges with the following part numbers:
18056, 18082, L33L188G1E, L33L188G1E9U, L3BT188G1, L3BT188G1A, 24356, 24392, 250-25066, 350-35045
Frequently Asked Questions
Is the DENSO 234-5012 air / fuel ratio sensor right for the 2007-2012 Mazda CX-7 4-cylinder 2.3L?
Yes. DENSO 234-5012 is a direct-fit upstream sensor for the 2007-2012 Mazda CX-7 4-cylinder 2.3L (L4-2.3L), and that engine takes one.
How many wires does this DENSO wide-band air / fuel sensor have?
This air / fuel ratio sensor has 5 wires with a male connector and a 31.50 inch wiring harness. The sensor is heated.
Is this an upstream or downstream air / fuel ratio sensor?
Upstream. DENSO 234-5012 is listed for the upstream position and has a 0.711 inch thread diameter.
Can a bad air / fuel ratio sensor turn on the check engine light?
It can, along with rough running or poorer fuel economy, but other faults can look the same. A shop can test the sensor's signal, which is best left to them.
What keeps contamination away from the ceramic element in this air / fuel ratio sensor?
A PTFE filter blocks contaminants, and dual-layer protection shields the ceramic element. The laser-welded stainless housing resists corrosion.
