Check Engine Light On After Sensor Swap in Khyber — What Could Be Wrong?

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Check Engine Light On After Sensor Swap in Khyber — What Could Be Wrong?

After replacing a couple of sensors during my EFI upgrade MAF and TPS, the check engine light stays on in my Suzuki Khyber. I’m not sure which sensor is triggering it, and my scanner can’t read any codes. Is it possible the sensors are not compatible o r poorly grounded?

Gari Specialist asked on 16 Apr 2025 12:51:11 pm

1 Answer

9 views |

Gari Master - on 16 Apr 2025 12:53:13 pm

The check engine light CEL coming on after sensor changes is a red flag that the ECU is getting conflicting o r faulty signals.

Possible Reasons:
Incompatible Sensors: Using a sensor from a different car o r model e.g., Toyota sensor in Suzuki setup without proper calibration will throw errors.

Improper Grounding o r Wiring: Sensor signals depend heavily on clean wiring. Poor ground o r corroded terminals can send weak o r false signals.

Faulty Replacement Sensors: Aftermarket sensors in Pakistan especially Chinese brands often come DOA dead on arrival o r give inaccurate readings.

ECU Reset Required: Sometimes, the ECU needs to be reset after sensor changes to clear stored error codes.

Fix:
Scan for trouble codes using a proper OBD-II scanner if possible depending on ECU compatibility.

Double-check the part numbers and compatibility of the sensors.

Re-check wiring and ground points.

Try resetting the ECU by disconnecting battery for 5-10 minutes.