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AEM X-Series OBDII Wideband UEGO AFR Sensor Controller Gauge
AEM X-Series OBDII Wideband UEGO AFR Sensor Controller Gauge
AEM X-Series OBDII Wideband UEGO AFR Sensor Controller Gauge
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AEM X-Series OBDII Wideband UEGO AFR Sensor Controller Gauge

Marsoni M251S
Sale price$129.12
Pay 4 payments of $32.28 a month.Shop Pay
Get it in 3 business days with 1 day shipping. Friday, May 29
AEM X-Series OBDII Wideband UEGO AFR Sensor Controller GaugeAccurate AFR data is critical when tuning an engine. Running rich (very low air fuel ratio, excessive fuel) can cause a loss in power, while running too lean (very high air fuel ratio, not enough fuel) may result in serious engine damage. Using a wideband air fuel controller during the tuning process allows you to monitor AFR and adjust tuning parameters to optimize them for maximum power and efficiency. AEM has a comprehensive line of highly
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
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4.6 ★★★★★
Based on 2255 reviews
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Verified Purchase
Carmen J Santora
Phoenix, US
★★★★★ 4
Nice touch
Allows for some organization, and looks nice. Pretty sturdy, and I have not had any issues with it, I was a little smaller than I hoped.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 28, 2020
S
Verified Purchase
Siddhartha
Battle Creek, US
★★★★★ 5
Nice quality
Seems very good quality. Will purchase again.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 18, 2025
J
Verified Purchase
J. Goff
Whiting, US
★★★★★ 5
Roomy
Looks even better in person. More room then I expected
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 31, 2025
S
Verified Purchase
Sb1
Cuba, US
★★★★★ 5
Nice
Great
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Reviewed in the United States on May 28, 2026
G
Verified Purchase
Gigi40ne
Phoenix, US
★★★★★ 5
Tray
This is the perfect size! I received my order sooner than expected when the first one wasn't delivered.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 17, 2025

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