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Description
Rostra 250-1903-BZ35 BackZone Plus Rear-Mount Ultrasonic Automotive Parking Assistance System with 4-Sensors, Digital Display, and 35-Foot HarnessIntroducing BackZone 35 (250 1903 BZ35), Rostras latest addition to our comprehensive line of vehicle parking assistance systems. Designed around the durable components that comprise our BackZone 35 system, BackZone 35 expands the usefulness of that system by adding an extra 10 feet to the sensor extension harness and a more powerful control module. Key features of this system include the following: Smaller Audible Visual Display Compared to Rostras
Introducing BackZone 35 (250-1903-BZ35), Rostra’s latest addition to our comprehensive line of vehicle parking assistance systems. Designed around the durable components that comprise our BackZone 35 system, BackZone 35 expands the usefulness of that system by adding an extra 10 feet to the sensor extension harness and a more powerful control module. Key features of this system include the following:
Smaller Audible/Visual Display
Compared to Rostra’s standard BackZone Plus and FrontZone parking assistance systems, the BackZone 35 includes a dashboard/visor mount display with a smaller overall footprint designed to more seamlessly blend into a vehicle’s interior.
35-Foot Truck Harness
BackZone 35 sensor-to-module wire harnessUltrasonic parking assistance systems typically require the use of harness extensions when being installed onto light or heavy-duty trucks. These extensions can introduce multiple points of failure and interference. That changes with BackZone 35. Each BackZone 35 system includes a weather-proof 35’ harness designed to connect the four bumper-mounted ultrasonic sensors to the BackZone control module in a single run.
BackZone 35 Control Module
BackZone 35 contorl module with advanced object detectionThe BackZone 35 control module is specific to this particular parking assistance system and includes an internal electronics redesign necessary to transmit interference-free signals from the bumper-mounted ultrasonic sensors along the 35-foot harness.
- Safer Parking Decisions - Make safer parking decisions by using a BackZone 35 automotive parking assist to alert you to obstacles closing in on your vehicle while parking.
- Ultrasonic Detection - BackZone Plus' advanced ultrasonic-based technology means the system offers consistency on targets of all densities with fewer false alarms.
- Paintable Bumper Sensors - The flat black sensors included with each 250-1903-BZ35 BackZone 35 kit can be painted to match the factory fit and finish of your car!
- Audible Alarm - The audible alarm included in each BackZone Plus automotive parking assist kit provides a unique way of alerting drivers to nearby unseen obstacles.
BackZone 35 Included Components
- Full-color retail packaging with space of barcode labels.
- Glossy installation/owner’s manual with high-resolution images.
- Drilling template for accurately aligning sensors to bumper.
- Four flush-mount ultrasonic sensors with paintable bezel.
- Four rubber insulator sensor sleeves for use on steel bumpers.
- Four under-bumper mounts for mounting beneath bumpers.
- Stainless steel under-bumper mounting hardware.
- 35-foot sensor to control module extension harness.
- BackZone 35 control module with advanced firmware.
- Dashboard/Visor audio-visual display *.
- Standalone buzzer (for audio alerts only) **.
- 19-foot module-to-display extension harness.
- 21.5 mm hole saw for use with sensor-only installation.
- 24.5 mm hole saw for use with rubber insulator installation.
- Two-wire harness for making power and ground connections.
- Two quick splice connectors for use on power and ground wires.
- Cable ties for securing extension harness to vehicle body.
- Four 6-degree angled sensor bezels for angled bumper covers.
- Four 12-degree angled sensor bezels for angled bumper covers.
- 3M VHB mounting tape to secure control module in place.
- 3M VHB mounting tape for securing dashboard display in place.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.1 ★★★★★
Based on 331 reviews
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Product Reviews
★★★★★ 5
Quality product
Seeing as it passed the smog test without any issues, it seems this product worked exactly as intended.
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Reviewed in the United States on May 20, 2026
★★★★★ 5
So far so good
It seems to be working well, so far. The check engine light turned off and the my vehicle seems to be running well. Be sure to follow the instructions. A while back, I wasted some money on a different catalytic converter cleaner because I put the cleaner in on a full tank of gas. It's best to wait until you're at a half tank or less of gasoline before you put in your catalytic converter cleaner. Also, I drove around right after I put in the catalytic converter cleaner and before I filled up my tank again. A couple of days later, I went to the gas station and topped off my tank. Again, it seems to be running well for now.
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Reviewed in the United States on April 21, 2026
★★★★★ 4
Works ok for some stuff.
I tried this mainly to clean my cats. It sadly didn't work for that at all.
It did however work great as a basic fuel system cleaner. It smoothed out my idle and cleaned my O2 sensors they were a bit lazy before using this product now they switch fast like they are supposed too.
In terms of my recommendation I say use as a fuel system cleaner. Or if your cats aren't too clogged in my case I bought an old neglected used car that likely had that problem for years. So I don't think any pour in tank cleaner would work in my case.
However if your car just started having cat issues. This might work??
I think it's worth a try at least and isn't much more expensive than a basic fuel system cleaner so why not?
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Reviewed in the United States on May 16, 2026
★★★★★ 5
PASSED MY INSPECTION! THIS PRODUCT WORKS LIKE A MIRACLE DONT HESITATE TO BUY IT!
Inspection on my car due the end of January! My check engine light was coming on so I checked with a code reader & found it was a P0420. Read about the Catalytic Converter System possibly being in need of replacement or perhaps clogged. I am a woman, and know next to ZERO about cars, but I can read. Did investigate and found that the replacement of a Catalytic Converter system is mad expensive- also found this Moly Cleaner to add to gas tank. I'm not going to lie; I was nervous as I have a Kia Rio 2014 that has a very small gas tank and gets great gas mileage. In reading the consensus seemed to be to add to 1/4 tank of gas and drive fast for good periods of time to blow out the clog (if it was a clog). Did I mention I live in NYC and driving for long periods of time at high speeds can be a problem because of terrible traffic. Anyhow, this Saturday I poured the can into my 1/2 filled tank and hit a parkway near my home early morning. I did drive for 45 miles sometimes at 80mph then 60mph but tried to do it for a good few minutes at a time without getting pulled over. Checked my reader again, and it was not quite ready but the engine light did stay off. Next day, drove to work, stuck in traffic somewhat & never made it over 20mph & checked my reader again- all good to go for inspection. Went last night- my car PASSED and got that sticker in my window- so I am good for another year. The BEST money I have spent all year. Thank you for carrying this product! Saved me thousands! DONT HESITATE TO USE THIS. The hardest part for me was removing the cap on the can!
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Reviewed in the United States on January 13, 2026
★★★★★ 5
Great stuff
Seemed to work as well as or better than some more expensive catalytic converter cleaners. I put it in while at 1/3 tank and my Check Engine light went out almost immediately once I started driving. My Tundra has almost 230,000 miles and still runs great but was getting a little harder to start after I switched from full synthetic oil to conventional. I’ll never do that again and immediately switched back but the damage was done. Check engine light came on and I had to crank longer to get it started. Adding this Liquid Moly fixed both issues temporarily. I have to wonder if this was used regularly, say every 3 months, if it would clean the catalytic converter more permanently?
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Reviewed in the United States on December 29, 2025