Toyota RAV4: Common Codes & Fixes

Real-world diagnostic data for the Toyota RAV4. These are the codes techs see most often. Tap any code for the full vehicle-specific fix and the exact part.

20 codes have specific fixes for the Toyota RAV4
B2799 Engine immobilizer system malfunction -- the transponder key is not being recognized. 2007-2019 · moderate DIY · 1-2 hours C1095 RAV4 C1095 can sometimes be caused by a weak battery -- the pump draws 20+ amps at startup and a tired battery sags too low to run it. 2006-2018 · hard DIY · 3-4 hours C1201 C1201 is a companion code -- it means the ABS/VSC system detected a fault in the engine control system. 2007-2019 · easy (scan and fix engine code) DIY · Varies (depends on engine code) P0012 Intake camshaft timing is over-retarded. 2007-2017 · Easy DIY · 0.5-1 hour P0030 The upstream oxygen sensor heater circuit on bank 1 fails when the internal heater element burns out or the connector corrodes. 2005-2018 · easy DIY · 30-45 min P0031 Air/fuel ratio sensor (upstream O2) heater element fails — Toyota A/F sensors are heater-heavy and fail earlier than downstream sensors. 2002-2015 · Easy DIY · 30 min P0036 The downstream O2 sensor heater on bank 1 (post-catalytic converter) fails from age and thermal cycling. 2005-2018 · easy DIY · 30-45 min P0138 Downstream O2 sensor stuck high. 2007-2017 · Easy DIY · 30 min P0172 A dirty MAF sensor underreporting airflow is the most common cause of P0172 on the 2AR-FE. 2007-2017 · easy DIY · 10 min P0202 Injector 2 circuit open or shorted. 2007-2017 · Moderate DIY · 1-1.5 hours P0261 Toyota fuel injector circuit low codes are less common than on domestic vehicles. 2005-2018 · moderate DIY · 30 min - 1 hour P0325 Knock sensor is located under the intake manifold on the 2AR-FE engine. 2007-2017 · moderate DIY · 2-3 hours P0327 Knock sensor below the intake manifold has low output. 2007-2017 · Moderate DIY · 2-3 hours P0335 Crankshaft position sensor located behind the oil filter at the front of the engine near the crank pulley. 2007-2017 · easy DIY · 30 min P0421 P0421 indicates the warm-up catalytic converter on Bank 1 is not reaching operating efficiency fast enough. 2007-2019 · moderate to hard DIY · 1.5-3 hours P0444 Check the wiring harness between the ECM and the purge solenoid for chafed or broken wires. 2007-2019 · moderate DIY · 30 min - 1 hour P0765 Shift solenoid SL2 (solenoid D equivalent) on Toyota U-series transmissions has high failure rates in cold climates due to fluid… 2006-2018 · Advanced DIY · 3-5 hours P2138 Replace accelerator pedal position sensor (integrated with pedal assembly). 2002-2015 · easy DIY · 30 min P3280 Highlander and RAV4 P3280 codes commonly come from a failing canister close valve or a cracked charcoal canister. 2008-2018 · Moderate DIY · 2-3 hours U0100 U0100 on Toyota is less common than on domestics and usually indicates a more serious fault. 2007-2019 · moderate DIY · 1-3 hours

Frequently Asked Questions

What are the most common check engine light codes on a Toyota RAV4?

The most commonly reported OBD-II codes for the Toyota RAV4 include B2799, C1095, C1201, P0012, P0030. Each code indicates a specific issue -- tap any code above for the full diagnostic breakdown.

How much does it cost to fix a check engine light on a Toyota RAV4?

Repair costs vary by code. Many Toyota RAV4 fixes like gas cap replacement, sensor cleaning, or spark plug changes are under $50 in parts and can be done at home. More complex repairs like catalytic converter or transmission work can run $500-$2,000+ at a shop.

Can I drive my Toyota RAV4 with the check engine light on?

It depends on the code. A steady check engine light usually means you can drive short distances safely. A flashing check engine light means stop driving immediately -- continued driving can cause serious engine damage. Scan the code first to know what you are dealing with.

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