- MHD Part #: CH109AA
- |
- Brand: MCT
NOX SENSOR 68197109AA
MCT CH109AA is a replacement NOx sensor that cross-references OE 68197109AA for diesel exhaust aftertreatment systems. It measures nitrogen oxides in the exhaust stream so the ECU can manage SCR dosing and emission strategy correctly. Use it to restore accurate NOx feedback and resolve emissions-related faults where 68197109AA is specified.
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Product Overview
MCT part number CH109AA is a replacement NOx sensor aligned with OE 68197109AA for diesel exhaust aftertreatment systems. Aftermarket listings classify CH109AA within the exhaust/NOx sensor category, reflecting its role in the emissions control system. The sensor monitors nitrogen oxide levels in the exhaust so the engine control module can execute the correct emission strategy. Cross-reference information commonly associates 68197109AA with cleaner, more efficient exhaust operation; CH109AA is intended to restore that monitoring capability wherever the OE number is specified. Interchange references include 68227486AA as an alternate OE number, along with equivalents such as Dorman 904-6029 and Automann 577.34500.
Role in Aftertreatment and Service Notes
By providing real-time NOx feedback, this sensor supports accurate SCR dosing and stable aftertreatment control, helping maintain emission compliance and preventing drivability issues tied to incorrect readings. When an original sensor ages or fails, replacing it with CH109AA helps the ECU validate exhaust chemistry, reduce nuisance emission faults, and protect uptime. For correct fit, confirm the OE number on the failed unit and match connector style and harness routing to the vehicle build. Install on the exhaust circuit location specified by the OEM for 68197109AA, then perform any manufacturer-recommended relearn or diagnostic checks to verify signal plausibility and close out fault codes.
Compatibility
CH109AA is marketed as a functional replacement where 68197109AA is specified in diesel exhaust applications, including certain Dodge Ram listings noted in aftermarket sources. Always verify part number, sensor location, and harness length against the vehicle’s service information before ordering.
Product Features
- OE 68197109AA reference matching ensures drop-in replacement and compatible ECU communication.
- Real-time NOx measurement enables precise SCR dosing for consistent emissions control.
- Aftermarket interchange coverage (68227486AA, Dorman 904-6029, Automann 577.34500) provides sourcing flexibility.
- Robust sensor design supports operation in high-heat, high-vibration exhaust environments.
- Restores accurate feedback to help reduce emissions-related fault codes and derate events.
- Supports uptime by helping stabilize aftertreatment performance after a failed sensor replacement.
Product Specifications
| Brand: | MCT |
|---|---|
| Part Number: | CH109AA |
| Category: | Exhaust |
| Sub-Category: | NOx Sensors |
| OE Number: | 68197109AA |
| OE Number (Alt): | 68227486AA |
| Interchange (Dorman): | 904-6029 |
| Interchange (Automann): | 577.34500 |
|---|---|
| Application Category: | Exhaust emissions / NOx measurement |
| SPN: | TR_CH109AA |
| Shipping Weight: | 1.00 (lbs) |
| Shipping Height: | 3.00 (in) |
| Shipping Width: | 5.00 (in) |
| Shipping Length: | 5.00 (in) |
| Name | Interchange |
|---|---|
| Automann | 577.34500 |
| Dorman | 904-6029 |
| Interchange | 68197109AA, 68227486AA |
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