Poor fuel average after a bad tune-up

Symptoms

5-6 km/L

Likely cause

Non-OEM coils, dirty MAF/throttle, wrong AFR

Fix

OEM coils and plugs, clean MAF/throttle body, check the O2 sensor

Applies to

ZZE121R 1.6 AT (forum)

Related fault codes

P0171/P0172

Confidence

low

Sources

• pakwheels.com/forums/t/corolla-2004-se-saloon-1-6-at-bad-fuel-average-

Related problems on this car

• Ignition coil-on-plug failure / misfire
• Upstream O2 sensor ageing
• Dirty MAF sensor
• A/C compressor failure / poor cooling

Similar problems on other cars

• High fuel consumption · Toyota Passo (1st gen)
• Low fuel average in the city · Suzuki Wagon R (Pakistan, K10B)

Where the parts are · Warning lights · Fault codes · Maintenance

Guidance only – confirm with a mechanic before repairs. All common problems