Have Questions?
Professional-grade parts used trackside.
Expert help during business hours.
Encrypted checkout & trusted payments.
Orders ship quickly from regional warehouses.
The AEM Bosch LSU 4.2 Wideband UEGO Replacement Sensor is engineered for precise air-fuel ratio measurement in automotive applications. Featuring a laser-etched, calibrated resistor integrated within the sensor's connector body, this sensor ensures consistent and accurate readings tailored specifically to its calibration. The sensor is laboratory-calibrated at the Bosch factory, providing an accuracy of 0.1 AFR, and it is designed to never require free-air calibration when used with an AEM wideband AFR controller. Its sealed housing, built with a 360-degree welded wetted area, offers high resistance to automotive fluids, ensuring durability and longevity in demanding environments. The package includes a connector and pins for easy installation, making it a reliable replacement part for compatible systems. This sensor is ideal for enthusiasts and professionals seeking precise air-fuel ratio monitoring to optimize engine performance and emissions compliance. The Bosch LSU 4.2 sensor's robust construction and factory calibration make it suitable for a wide range of tuning applications, providing consistent and accurate data crucial for performance tuning and diagnostics. Please note that modifying the integrated resistor will invalidate the sensor's output, so proper handling and installation are essential to maintain its accuracy and warranty.
Features:
Order Processing
All orders are processed and shipped within 24 hours of purchase (excluding weekends and holidays).
Orders placed after 3:00 PM EST may ship the following business day.
Shipping Methods
Customers select their preferred shipping method and speed at checkout.
Shipping times are determined by the carrier and cannot be guaranteed by us.
Tracking information will be provided once your order has shipped.
Shipping Coverage
If your package arrives damaged, please notify the delivery driver immediately and contact the shipping carrier to file a claim.
You must report any missing or damaged items within 14 days of delivery.
After this time, we cannot be held responsible for lost or damaged items.
Return Window
You have 30 days from the date of delivery to request a return.
After 30 days, we are unable to accept returns, exchanges, or refund requests.
Eligibility
Items must be returned in their original condition—unused, unwashed, and with all tags and packaging intact.
Certain products may not be eligible for return (e.g., special-order items, customized products, or perishable goods).
Items that have been altered, installed, or modified cannot be returned.
Return Process
Contact our Customer Support team to request a Return Authorization (RMA) before sending items back.
Once your return is approved, you’ll receive instructions on where to send the product.
Customers are responsible for return shipping costs unless the item was defective or incorrect.
Refunds
Refunds are issued to the original payment method once the returned item has been received and inspected.
Please allow 5–10 business days for the refund to appear on your account.
In some cases, a restocking fee may apply (if applicable, this will be disclosed during your return authorization).
