Check Engine lit up on Chery: causes, error decoding and ways to fix it

ByAlex Smidt

The Check Engine light on Chery comes on suddenly and immediately worries owners of Tiggo, Arrizo, Omoda, Jaecoo and other models. This signal from the engine control unit indicates a fault in systems that affect power, fuel consumption and environmental performance. Ignoring the light often leads to more serious breakdowns, while timely diagnostics usually solves the problem quickly and inexpensively. This article brings together the main causes, detailed decoding of common errors and proven elimination methods — the information will help owners of all Chery models navigate the situation and make the right decision.

Why Check Engine lights up on Chery

The lamp activates when the control unit detects a deviation from normal parameters. Causes can be simple (fuel cap, dirty sensors) or complex (catalytic converter, injectors). On all Chery models — Tiggo 4, Tiggo 7 Pro, Tiggo 8 Pro, Arrizo 5, Arrizo 6, Arrizo 8, Omoda 5, Omoda 6, Jaecoo J7 and others — faults in the fuel system, ignition and exhaust are most common. A flashing Check Engine requires an immediate engine stop — this is a sign of misfires that can damage the catalytic converter. A steady light usually points to a less critical issue, but diagnostics should still be done as soon as possible.

Main causes of the lamp activation

  • Faulty mass air flow sensor.
  • Problems with oxygen sensors.
  • Misfires due to spark plugs or ignition coils.
  • Reduced catalytic converter efficiency.
  • Faults in the fuel system circuits.
  • Issues in the cooling system or wiring.

The first step is diagnostics with an OBD scanner. It shows the exact error code and helps avoid replacing working parts on any Chery model.

Decoding and fixing common errors

P0100 — mass air flow sensor circuit malfunction. Symptoms: power loss, unstable idle. Solution: check wiring and connectors, replace the sensor if necessary.

P0101 — mass air flow sensor performance problem. Often caused by contamination. Solution: clean the sensor with a special cleaner or replace it.

P0102 — low input from mass air flow sensor. Causes: break or dirt. Solution: inspect contacts, clean or replace.

P0103 — high input from mass air flow sensor. Solution: check wiring for short circuit.

P0115 — engine coolant temperature sensor circuit malfunction. Symptoms: unstable operation of a cold engine. Solution: replace the sensor.

P0130 — oxygen sensor circuit malfunction (bank 1, sensor 1). Solution: check the heater and replace the lambda sensor.

P0171 — system too lean. Causes: air leak, weak fuel pump. Solution: find and fix the leak, check fuel pressure.

P0172 — system too rich. Solution: clean the injectors or replace the pressure regulator.

P0300 — random misfire detected. Symptoms: engine misfiring. Solution: replace spark plugs and ignition coils.

P0301–P0304 — misfire in a specific cylinder. Solution: check the spark plug, coil and compression in that cylinder.

P0420 — catalyst system efficiency below threshold. A common error on many Chery models. Solution: check lambda sensors before and after the converter, fix exhaust leaks.

P0442 — evaporative emission system leak detected (small leak). Solution: check the fuel tank cap and hoses.

P0501 — vehicle speed sensor range/performance problem. Solution: replace the sensor or inspect the wiring.

P0606 — control module processor fault. Solution: reflash or replace the ECU.

P1130 — lambda sensor heater circuit malfunction. Solution: replace the sensor.

P0401 — exhaust gas recirculation flow insufficient. Solution: clean the EGR valve.

P0122 — throttle/pedal position sensor circuit low input. Solution: check and replace the sensor.

P0222 — throttle/pedal position sensor switch circuit low input. Solution: perform calibration or replacement.

P0650 — malfunction indicator lamp control circuit. Solution: check the lamp and circuit.

P0305–P0306 — misfire in cylinders 5–6. Solution: check spark plugs, coils and compression.

These codes cover most cases on all Chery models. Scanning gives a clear direction for repair.

How to diagnose and reset the error yourself

Buy a compact OBD2 scanner with Chery support. Connect it to the port under the steering wheel, read the codes and clear them after fixing the cause. If the light stays on, look for hidden faults. Regularly check oil level, spark plug condition and filters — this is the best prevention for any model.

Recommendations for long engine life on Chery

Use quality fuel and change filters and fluids on time. At the first signs (misfiring, loss of power, increased consumption) perform diagnostics immediately. On all Chery models pay special attention to the catalytic converter and lambda sensors. A comprehensive approach preserves engine life and helps avoid unexpected problems. Regular maintenance turns Check Engine from a worrying signal into a useful system prompt.